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TWI737897B - Interlayer film for laminated glass and laminated glass - Google Patents

Interlayer film for laminated glass and laminated glass Download PDF

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Publication number
TWI737897B
TWI737897B TW107108829A TW107108829A TWI737897B TW I737897 B TWI737897 B TW I737897B TW 107108829 A TW107108829 A TW 107108829A TW 107108829 A TW107108829 A TW 107108829A TW I737897 B TWI737897 B TW I737897B
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TW
Taiwan
Prior art keywords
interlayer film
laminated glass
layer
intermediate film
film
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Application number
TW107108829A
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Chinese (zh)
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TW201840507A (en
Inventor
西野博満
木戶浩二
太田祐輔
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日商積水化學工業股份有限公司
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Publication of TW201840507A publication Critical patent/TW201840507A/en
Application granted granted Critical
Publication of TWI737897B publication Critical patent/TWI737897B/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10559—Shape of the cross-section
    • B32B17/10568—Shape of the cross-section varying in thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10605—Type of plasticiser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10678—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer comprising UV absorbers or stabilizers, e.g. antioxidants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10816—Making laminated safety glass or glazing; Apparatus therefor by pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10816—Making laminated safety glass or glazing; Apparatus therefor by pressing
    • B32B17/10871—Making laminated safety glass or glazing; Apparatus therefor by pressing in combination with particular heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/22—Layered products comprising a layer of synthetic resin characterised by the use of special additives using plasticisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J1/00—Windows; Windscreens; Accessories therefor
    • B60J1/02—Windows; Windscreens; Accessories therefor arranged at the vehicle front, e.g. structure of the glazing, mounting of the glazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2331/00—Polyvinylesters
    • B32B2331/04—Polymers of vinyl acetate, e.g. PVA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/006—Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Instrument Panels (AREA)
  • Laminated Bodies (AREA)

Abstract

本發明提供一種於製作層合玻璃時可抑制部分楔角之變化，而抑制層合玻璃中之雙重影像之層合玻璃用中間膜。 本發明之層合玻璃用中間膜具有一端、及厚度大於上述一端之另一端，且上述中間膜之厚度自上述一端至上述另一端並非均一地增加，使用上述層合玻璃用中間膜作為壓接前之中間膜，經由特定步驟而獲得正式壓接後之中間膜，對於上述壓接前之中間膜及上述正式壓接後之中間膜之各者測定各部分楔角時，根據下述式(X)所求出之部分楔角之變化率之平均值為10%以下。 部分楔角之變化率(%)＝｜(正式壓接後之中間膜之部分楔角－壓接前之中間膜之部分楔角)/(壓接前之中間膜之部分楔角)｜×100 式(X)The present invention provides an interlayer film for laminated glass that can suppress the change of part of the wedge angle and suppress the double image in the laminated glass when the laminated glass is made. The interlayer film for laminated glass of the present invention has one end and the other end whose thickness is greater than the above one end, and the thickness of the interlayer film does not uniformly increase from the one end to the other end, and the interlayer film for laminated glass is used as the pressure bonding Before the intermediate film, the intermediate film after the formal crimping is obtained through specific steps. When measuring the wedge angle of each part of the intermediate film before the crimping and the intermediate film after the formal crimping, the wedge angle of each part is measured according to the following formula ( X) The average value of the rate of change of part of the wedge angle calculated is less than 10%. Change rate of partial wedge angle (%)=|(Partial wedge angle of the interlayer after formal crimping－Partial wedge angle of the interlayer before crimping)/(Partial wedge angle of the interlayer before crimping)|× 100 formula (X)

Description

層合玻璃用中間膜及層合玻璃Interlayer film for laminated glass and laminated glass

本發明係關於一種用以獲得層合玻璃之層合玻璃用中間膜。又，本發明係關於一種使用上述層合玻璃用中間膜之層合玻璃。The present invention relates to an interlayer film for laminated glass for obtaining laminated glass. In addition, the present invention relates to a laminated glass using the above-mentioned interlayer film for laminated glass.

層合玻璃一般即便受到外部衝擊而破損，亦玻璃碎片之飛散量較少而安全性優異。因此，上述層合玻璃係廣泛用於汽車、軌道車輛、航空器、船舶及建築物等。上述層合玻璃係藉由在一對玻璃板之間挾入層合玻璃用中間膜而製造。 又，作為汽車所使用之上述層合玻璃，已知有抬頭顯示器(HUD)。於HUD中，可使汽車之擋風玻璃顯示作為汽車之行駛資料之速度等測量資訊等。 關於上述HUD，存在擋風玻璃所顯示之測量資訊看起來成雙影之問題。 為了抑制雙重影像，而使用楔狀之中間膜。於下述之專利文獻1中揭示有於一對玻璃板之間挾入具有特定楔角之楔狀中間膜而成之層合玻璃。關於此種層合玻璃，可藉由調整中間膜之楔角，而於駕駛者之視野內將1個玻璃板所反射之測量資訊之顯示、與另一玻璃板所反射之測量資訊之顯示連結成1點。因此，測量資訊之顯示不易看起來雙影，而不易妨礙駕駛者之視野。 [先前技術文獻] [專利文獻] [專利文獻1]日本專利特表平4-502525號公報Generally, even if laminated glass is damaged by external impact, the amount of scattered glass fragments is small and the safety is excellent. Therefore, the above-mentioned laminated glass system is widely used in automobiles, rail vehicles, aircraft, ships, buildings, etc. The above-mentioned laminated glass is produced by sandwiching an interlayer film for laminated glass between a pair of glass plates. Moreover, as the above-mentioned laminated glass used in automobiles, a head-up display (HUD) is known. In the HUD, the windshield of the car can be used to display the speed and other measurement information as the driving data of the car. Regarding the above-mentioned HUD, there is a problem that the measurement information displayed on the windshield looks like a double shadow. In order to suppress double images, a wedge-shaped intermediate film is used. Patent Document 1 below discloses a laminated glass in which a wedge-shaped interlayer film having a specific wedge angle is sandwiched between a pair of glass plates. Regarding this type of laminated glass, by adjusting the wedge angle of the intermediate film, the display of the measurement information reflected by one glass plate and the display of the measurement information reflected by the other glass plate can be connected in the driver's field of vision. Into 1 point. Therefore, the display of measurement information is not easy to look double-shadow, and it is not easy to obstruct the driver's field of vision. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Publication No. 4-502525

[發明所欲解決之問題] 於製造層合玻璃之前，中間膜係為了抑制雙重影像而以具有特定楔角之方式製作。然而，先前之中間膜有於製作層合玻璃時之壓接時中間膜之楔角大幅變化之情況。作為結果，有無法充分地抑制雙重影像之情況。 本發明之目的在於提供一種於製作層合玻璃時可抑制部分楔角之變化，而抑制層合玻璃中之雙重影像之層合玻璃用中間膜。又，本發明之目的亦在於提供一種使用上述層合玻璃用中間膜之層合玻璃。 [解決問題之技術手段] 根據本發明之較廣態樣，提供一種層合玻璃用中間膜(本說明書中有時將「層合玻璃用中間膜」簡稱為「中間膜」)，其係層合玻璃所使用者，其具有一端、與位於上述一端之相反側之另一端，上述另一端之厚度大於上述一端之厚度，上述中間膜之厚度自上述一端至上述另一端並非均一地增加，使用上述層合玻璃用中間膜作為壓接前之中間膜，依序經由以下之第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜，對於上述壓接前之中間膜及上述正式壓接後之中間膜之各者，於上述中間膜之從自上述一端起朝向另一端40 mm之位置至上述一端與上述另一端之間之中央位置為止的第1區域中每隔10 mm之各地點測定各部分楔角時，根據下述式(X)所求出之部分楔角之變化率之平均值為10%以下。 部分楔角之變化率(%)＝｜(正式壓接後之中間膜之部分楔角－壓接前之中間膜之部分楔角)/(壓接前之中間膜之部分楔角)｜×100 式(X) 第1步驟：將壓接前之中間膜自一表面側載置於第1玻璃板上。該第1玻璃板具有與壓接前之中間膜相同之大小且具有2 mm之厚度。該第1玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃。 第2步驟：將第2玻璃板以使上述第2玻璃板之一端與上述中間膜之一端對齊且使上述第2玻璃板之面方向與上述第1玻璃板之面方向成直角方向之方式載置於上述中間膜之另一表面上。該第2玻璃板具有與壓接前之中間膜相同之大小且具有2 mm之厚度。該第2玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃。 第3步驟：一邊固定上述第2玻璃板之上述一端一邊將上述第2玻璃板傾倒，使上述第2玻璃板之表面與上述中間膜之上述另一表面接觸，且將上述第2玻璃設為上述第2玻璃之重量於上述中間膜之上述另一表面上達到均衡之狀態。 第4步驟：藉由240℃及98 N/cm之線壓力之輥壓進行預壓接。 第5步驟：於140℃及1.3 MPa之壓力下進行正式壓接，而獲得正式壓接後之中間膜。所獲得之正式壓接後之中間膜係將正式壓接後之中間膜配置在上述第1玻璃板與上述第2玻璃板之間的積層體之狀態。 於本發明之中間膜之一特定態樣中，於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至自自上述另一端起朝向上述一端40 mm之位置為止的第2區域中之每隔10 mm之各地點測定各部分楔角時，根據上述式(X)所求出之部分楔角之變化率之最大值為15%以下。 於本發明之中間膜之一特定態樣中，上述中間膜係如下層合玻璃用中間膜，即於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述一端與上述另一端間之中央位置為止的區域中，於隔開之2個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。 於本發明之中間膜之一特定態樣中，上述中間膜係如下層合玻璃用中間膜，即於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述另一端之位置為止的區域中，於隔開之3個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。 於本發明之中間膜之一特定態樣中，上述中間膜包括23℃下之彈性模數G'為4 MPa以上之層。 於本發明之中間膜之一特定態樣中，上述中間膜包括23℃下之彈性模數G'為4 MPa以上之層作為表面層。 上述中間膜較佳為含有熱塑性樹脂。上述中間膜較佳為含有塑化劑。 於本發明之中間膜之一特定態樣中，上述中間膜具備含有熱塑性樹脂、與相對於上述熱塑性樹脂100重量份為25重量份以上且45重量份以下之含量之塑化劑之層。 於本發明之中間膜之一特定態樣中，上述中間膜包括第1層、與配置於上述第1層之第1表面側之第2層。 於本發明之中間膜之一特定態樣中，上述第1層含有聚乙烯縮醛樹脂，上述第2層含有聚乙烯縮醛樹脂，上述第1層中之上述聚乙烯縮醛樹脂之羥基之含有率低於上述第2層中之上述聚乙烯縮醛樹脂之羥基之含有率。 於本發明之中間膜之一特定態樣中，上述第1層含有聚乙烯縮醛樹脂，上述第2層含有聚乙烯縮醛樹脂，上述第1層含有塑化劑，上述第2層含有塑化劑，上述第1層中之上述塑化劑相對於上述第1層中之上述聚乙烯縮醛樹脂100重量份之含量高於上述第2層中之上述塑化劑相對於上述第2層中之上述聚乙烯縮醛樹脂100重量份之含量。 根據本發明之較廣態樣，提供一種層合玻璃，其具備：第1層合玻璃構件、第2層合玻璃構件、及配置於上述第1層合玻璃構件與上述第2層合玻璃構件之間之中間膜部，且上述中間膜部由上述之層合玻璃用中間膜所形成。 [發明之效果] 本發明之層合玻璃用中間膜係層合玻璃所使用之層合玻璃用中間膜。本發明之層合玻璃用中間膜具有一端、與位於上述一端之相反側之另一端，且上述另一端之厚度大於上述一端之厚度。於本發明之層合玻璃用中間膜中，上述中間膜之厚度自上述一端至上述另一端並非均一地增加。使用本發明之層合玻璃用中間膜作為壓接前之中間膜，依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜。對於上述壓接前之中間膜及上述正式壓接後之中間膜之各者，於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至上述一端與上述另一端間之中央位置為止的第1區域中之每隔10 mm之各地點測定各部分楔角。於該測定中，於本發明之層合玻璃用中間膜中，根據上述式(X)所求出之部分楔角之變化率之平均值為10%以下。於本發明之層合玻璃用中間膜中，由於包括上述之構成，故而於製作使用本發明之層合玻璃用中間膜之層合玻璃時可抑制部分楔角之變化，而抑制使用本發明之層合玻璃用中間膜之層合玻璃中之雙重影像。[Problem to be solved by the invention] Before the laminated glass is manufactured, the intermediate film is made with a specific wedge angle in order to suppress double images. However, in the previous interlayer film, the wedge angle of the interlayer film may change significantly during the pressing process during the production of laminated glass. As a result, there are cases where double images cannot be sufficiently suppressed. The object of the present invention is to provide an interlayer film for laminated glass that can suppress the change of part of the wedge angle during the production of laminated glass and suppress the double image in the laminated glass. Moreover, the object of the present invention is also to provide a laminated glass using the above-mentioned interlayer film for laminated glass. [Technical Means to Solve the Problem] According to the broader aspect of the present invention, an interlayer film for laminated glass is provided (in this specification, the "interlayer film for laminated glass" is sometimes referred to as "interlayer film"). For users of composite glass, it has one end and the other end on the opposite side of the one end, the thickness of the other end is greater than the thickness of the one end, the thickness of the intermediate film does not increase uniformly from the one end to the other end, use The above-mentioned interlayer film for laminated glass is used as the interlayer film before crimping, and the interlayer film after the formal crimping is obtained through the following steps 1, 2, 3, 4, and 5. Each of the intermediate film and the intermediate film after the above-mentioned formal crimping, in the first area of the intermediate film from a position of 40 mm from the one end to the other end to the center between the one end and the other end When measuring the wedge angle of each part every 10 mm, the average value of the change rate of the part wedge angle calculated according to the following formula (X) is less than 10%. Change rate of partial wedge angle (%)=|(Partial wedge angle of the interlayer after formal crimping－Partial wedge angle of the interlayer before crimping)/(Partial wedge angle of the interlayer before crimping)|× 100 Formula (X) Step 1: Place the interlayer film before crimping on the first glass plate from one surface side. The first glass plate has the same size as the intermediate film before crimping and has a thickness of 2 mm. The first glass plate is float plate glass obtained in accordance with JIS 3202-2011. Step 2: Load the second glass plate so that one end of the second glass plate is aligned with one end of the intermediate film and the surface direction of the second glass plate is at right angles to the surface direction of the first glass plate Place it on the other surface of the intermediate film. The second glass plate has the same size as the intermediate film before crimping and has a thickness of 2 mm. The second glass plate is float plate glass obtained in accordance with JIS 3202-2011. Step 3: Tilt the second glass plate while fixing the one end of the second glass plate, make the surface of the second glass plate contact the other surface of the intermediate film, and set the second glass as The weight of the second glass is balanced on the other surface of the intermediate film. Step 4: Perform pre-compression bonding by roller pressure at 240°C and 98 N/cm linear pressure. Step 5: Perform formal crimping at 140°C and a pressure of 1.3 MPa to obtain an intermediate film after formal crimping. The obtained interlayer film after the main pressure bonding is in a state where the interlayer film after the main pressure bonding is arranged in a laminate between the first glass plate and the second glass plate. In a specific aspect of the interlayer film of the present invention, in the second region of the interlayer film from a position 40 mm from the one end toward the other end to a position 40 mm from the other end toward the one end When measuring the wedge angle of each part every 10 mm, the maximum value of the rate of change of the wedge angle calculated according to the above formula (X) is 15% or less. In a specific aspect of the interlayer film of the present invention, the above-mentioned interlayer film is the following interlayer film for laminated glass, which is obtained by sequentially going through the above-mentioned first, second, third, fourth, and fifth steps. In the area of the intermediate film from the position of the one end to the central position between the one end and the other end of the intermediate film after the third step and before the fourth step when the interlayer film is connected, there are 2 More than one location is in a state where the interlayer film is in contact with the second glass plate. In a specific aspect of the interlayer film of the present invention, the above-mentioned interlayer film is the following interlayer film for laminated glass, which is obtained by sequentially going through the above-mentioned first, second, third, fourth, and fifth steps. When the interlayer film is connected, after the third step and before the fourth step, in the region of the interlayer film from the position of the one end to the position of the other end, 3 or more parts of the interlayer become the above The state where the interlayer film is in contact with the above-mentioned second glass plate. In a specific aspect of the intermediate film of the present invention, the intermediate film includes a layer having an elastic modulus G'at 23° C. of 4 MPa or more. In a specific aspect of the intermediate film of the present invention, the intermediate film includes a layer having an elastic modulus G'at 23° C. of 4 MPa or more as a surface layer. The above-mentioned intermediate film preferably contains a thermoplastic resin. The aforementioned intermediate film preferably contains a plasticizer. In a specific aspect of the interlayer film of the present invention, the interlayer film includes a layer containing a thermoplastic resin and a plasticizer with a content of 25 parts by weight or more and 45 parts by weight with respect to 100 parts by weight of the thermoplastic resin. In a specific aspect of the interlayer film of the present invention, the interlayer film includes a first layer and a second layer arranged on the first surface side of the first layer. In a specific aspect of the interlayer film of the present invention, the first layer contains a polyvinyl acetal resin, the second layer contains a polyvinyl acetal resin, and the hydroxyl group of the polyvinyl acetal resin in the first layer The content rate is lower than the content rate of the hydroxyl group of the polyvinyl acetal resin in the second layer. In a specific aspect of the interlayer film of the present invention, the first layer contains a polyvinyl acetal resin, the second layer contains a polyvinyl acetal resin, the first layer contains a plasticizer, and the second layer contains a plasticizer. The content of the plasticizer in the first layer relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is higher than that of the plasticizer in the second layer relative to the second layer The content of the above-mentioned polyvinyl acetal resin in 100 parts by weight. According to a broader aspect of the present invention, there is provided a laminated glass comprising: a first laminated glass member, a second laminated glass member, and arranged on the first laminated glass member and the second laminated glass member The intermediate film portion in between, and the intermediate film portion is formed of the aforementioned intermediate film for laminated glass. [Effects of the invention] The interlayer film for laminated glass of the present invention is an interlayer film for laminated glass used for laminated glass. The interlayer film for laminated glass of the present invention has one end and the other end located on the opposite side of the one end, and the thickness of the other end is greater than the thickness of the one end. In the interlayer film for laminated glass of the present invention, the thickness of the interlayer film does not uniformly increase from the one end to the other end. Using the interlayer film for laminated glass of the present invention as the interlayer film before pressure bonding, the interlayer film after the actual pressure bonding is obtained through the above-mentioned first, second, third, fourth, and fifth steps in sequence. For each of the intermediate film before crimping and the intermediate film after the formal crimping, the position of the intermediate film is 40 mm from the one end toward the other end to the center position between the one end and the other end Measure the wedge angle of each part at every 10 mm point in the first area so far. In this measurement, in the interlayer film for laminated glass of the present invention, the average value of the rate of change of the partial wedge angle determined by the above formula (X) is 10% or less. In the interlayer film for laminated glass of the present invention, since the above-mentioned constitution is included, it is possible to suppress the change of part of the wedge angle when manufacturing the laminated glass using the interlayer film for laminated glass of the present invention, and suppress the use of the present invention. The double image in the laminated glass of the interlayer film for laminated glass.

以下，對本發明之詳細內容進行說明。 本發明之層合玻璃用中間膜(本說明書中有時簡稱為「中間膜」)係用於層合玻璃。 本發明之中間膜具有1層構造或2層以上之構造。本發明之中間膜可具有1層之構造，亦可具有2層以上之構造。本發明之中間膜可具有2層之構造，亦可具有2層以上之構造，亦可具有3層之構造，亦可具有3層以上之構造。本發明之中間膜可為單層之中間膜，亦可為多層之中間膜。 本發明之中間膜具有一端、與位於上述一端之相反側之另一端。上述一端與上述另一端係於中間膜中相對向之兩側之端部。於本發明之中間膜中，上述另一端之厚度大於上述一端之厚度。 於本發明之中間膜中，上述中間膜之自上述一端至上述另一端厚度不均一地增加。本發明之中間膜於表面具有凸部，或於表面具有凹部。 準備與本發明之中間膜相同之大小及厚度2 mm之第1玻璃板。該第1玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃。準備與本發明之中間膜相同之大小及厚度2 mm之第2玻璃板。該第2玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃。使用本發明之中間膜作為壓接前之中間膜，依序經由以下之第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜。 第1步驟：將壓接前之中間膜自一表面側載置於第1玻璃板上。該第1玻璃板具有與壓接前之中間膜相同之大小且具有2 mm之厚度。該第1玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃。 第2步驟：將第2玻璃板以使上述第2玻璃板之一端與上述中間膜之一端對齊且使上述第2玻璃板之面方向與上述第1玻璃板之面方向成直角方向之方式載置於上述中間膜之另一表面上。該第2玻璃板具有與壓接前之中間膜相同之大小且具有2 mm之厚度。該第2玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃。 第3步驟：一邊固定上述第2玻璃板之上述一端一邊將上述第2玻璃板傾倒，使上述第2玻璃板之表面與上述中間膜之上述另一表面接觸，且將上述第2玻璃設為上述第2玻璃之重量於上述中間膜之上述另一表面上達到均衡之狀態。 第4步驟：藉由240℃及98 N/cm之線壓力之輥壓進行預壓接。 第5步驟：於140℃及1.3 MPa之壓力下進行正式壓接，而獲得正式壓接後之中間膜。所獲得之正式壓接後之中間膜係將正式壓接後之中間膜配置在上述第1玻璃板與上述第2玻璃板之間的積層體之狀態。 對於上述壓接前之中間膜及上述正式壓接後之中間膜之各者，於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至上述一端與上述另一端間之中央位置為止的第1區域(第1測定區域)之每隔10 mm之各地點測定各部分楔角時，根據下述式(X)所求出之部分楔角之變化率之平均值為10%以下。 部分楔角之變化率(%)＝｜(正式壓接後之中間膜之部分楔角－壓接前之中間膜之部分楔角)/(壓接前之中間膜之部分楔角)｜×100 式(X) 於本發明中，由於具備上述構成，故而於製作使用本發明之中間膜之層合玻璃時可抑制部分楔角之變化，而抑制使用本發明之中間膜之層合玻璃中之雙重影像。 部分楔角之變化率之平均值係藉由在上述第1區域中每隔10 mm之各地點(第1～第n地點(n為2以上之整數))分別求出部分楔角之變化率，將該部分楔角之變化率進行平均化而求出。 就於製作層合玻璃時進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像之觀點而言，於上述第1區域中每隔10 mm之各部分楔角之測定中，根據上述式(X)求出之部分楔角之變化率之平均值較佳為5%以下。 於自第1地點至第n地點為止(n為2以上之整數)測定部分楔角，而求出n個部分楔角之變化率之情形時，上述部分楔角之變化率之平均值意指n個部分楔角之變化率之平均值。 於本發明之中間膜之從自上述一端起朝向上述另一端40 mm之位置至自上述另一端起朝向上述一端40 mm之位置為止的第2區域(第2測定區域)中每隔10 mm之各地點測定各部分楔角。於該測定中，根據上述式(X)求出之部分楔角之變化率之最大值較佳為15%以下，更佳為10%以下，進而較佳為5%以下。若上述最大值為上述下限以上及上述上限以下，則於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像。 於自第1地點至第n地點為止(n為2以上之整數)測定部分楔角，而求出n個部分楔角之變化率之情形時，部分楔角之變化率之最大值意指n個部分楔角之變化率中之最大值。 具體而言，於第1～第n地點之部分楔角之變化率係分別根據下述式(X1)～(Xn)而求出。 於第1地點之部分楔角之變化率(%)＝｜(正式壓接後之中間膜於第1地點之部分楔角－壓接前之中間膜於第1地點之部分楔角)/(壓接前之中間膜於第1地點之部分楔角)｜×100 式(X1) 於第2地點之部分楔角之變化率(%)＝｜(正式壓接後之中間膜於第2地點之部分楔角－壓接前之中間膜於第2地點之部分楔角)/(壓接前之中間膜於第2地點之部分楔角)｜×100 式(X2) (式(X3)～式(Xn-1)係省略) 於第n地點之部分楔角之變化率(%)＝｜(正式壓接後之中間膜於第n地點之部分楔角－壓接前之中間膜於第n地點之部分楔角)/(壓接前之中間膜於第n地點之部分楔角)｜×100 式(Xn) 於在上述第1區域內進行測定之情形時，第1地點係上述第1區域中每隔10 mm之地點中，最靠近上述一端側之地點。於在上述第1區域內進行測定之情形時，第n地點係上述第1區域中每隔10 mm之地點中，最靠近上述另一端側之地點。於在上述第2區域內進行測定之情形時，第1地點係上述第2區域中每隔10 mm之地點中，最靠近上述一端側之地點。於在上述第2區域內進行測定之情形時，第n地點係上述第2區域中每隔10 mm之地點中，最靠近上述另一端側之地點。 第1地點係上述中間膜之距離上述一端且朝向上述另一端40 mm之地點。第2地點係上述中間膜之距離上述一端且朝向上述另一端50 mm之地點。第n地點係上述中間膜之距離上述一端且朝向上述另一端(40＋10×(n－1))mm之地點。 n為相當於在於上述第1區域內及上述第2區域內之各自測定中，能夠測定部分楔角之地點之合計數。 於如上述般於上述第1區域內進行測定之情形時，第n地點係上述第1區域中每隔10 mm之地點中，最靠近上述另一端側之地點。於在上述第1區域內進行測定之情形時，第n地點係自第1地點每隔10 mm間隔依序選擇各地點(第2地點、第3地點、・・・)時，於不超過另一端側之範圍內選擇上述中間膜之上述一端與上述另一端之間之中央位置。於在上述第1區域內進行測定之情形時，第n地點亦可與上述中間膜之上述一端與上述另一端之間之中央位置一致，第n地點亦可較上述中間膜之上述一端與上述另一端之間之中央位置靠近上述一端側。於在上述第1區域內進行測定之情形時，第n地點較上述中間膜之上述一端與上述另一端之間之中央位置不靠近上述另一端側。 於如上述般於上述第2區域內進行測定之情形時，第n地點係上述第2區域中每隔10 mm之地點中，最靠近上述另一端側之地點。於在上述第2區域內進行測定之情形時，第n地點係自第1地點每隔10 mm間隔依序選擇各地點(第2地點、第3地點、・・・)時，於不超過另一端側之範圍內選擇上述中間膜之自上述另一端起朝向上述一端40 mm之位置。於在上述第2區域內進行測定之情形時，第n地點亦可與上述中間膜之上述一端與上述另一端之間之中央位置一致，第n地點亦可較上述中間膜之自上述另一端起朝向上述一端40 mm之位置靠近上述一端側。於在上述第2區域內進行測定之情形時，第n地點較上述中間膜之自上述另一端起朝向上述一端40 mm之位置不靠近上述另一端側。 於自第1地點至第n地點為止(n為2以上之整數)測定部分楔角之情形時，部分楔角之變化率之平均值係根據下述式(Y)求出。 部分楔角之變化率之平均(%)＝(於第1地點之部分楔角之變化率＋於第2地點之部分楔角之變化率＋・・・＋於第n地點之部分楔角之變化率)/n 式(Y) 於上述式(Y)中，n為2以上之整數。又，n為能夠測定部分楔角之地點之合計數。 繼而，對於壓接前之中間膜及正式壓接後之中間膜之各者中，於每隔10 mm間隔之各地點測定部分楔角之具體方法進行說明。 於壓接前之中間膜之每隔10 mm之各地點測定部分楔角之具體方法： 上述於壓接前之中間膜之每隔10 mm之各地點求出部分楔角之方法係如下所示。 作為於上述壓接前之中間膜之每隔10 mm之各地點測定部分楔角時所使用之測定機器，可列舉：接觸式厚度測量器「TOF-4R」(山文電氣公司製造)等。 於第1地點求出部分楔角之方法係如下所示。於上述壓接前之中間膜之自上述一端直至距離上述一端之位置且朝向上述另一端80 mm之位置，於每隔2 mm間隔之41個地點測定厚度。將自一端(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述壓接前之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成之內角設為於第1地點之部分楔角。 於第2地點求出部分楔角之方法係如下所示。於上述壓接前之中間膜之從自上述一端起朝向上述另一端10 mm之位置至距離上述一端且朝向上述另一端90 mm之位置，於每隔2 mm間隔之41個地點測定厚度。將自距離一端20 mm之位置(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述壓接前之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成之內角設為於第2地點之部分楔角。 (於第3地點～第n－1之地點求出部分楔角之方法省略) 於第n地點求出部分楔角之方法係如下所示。上述壓接前之中間膜之距離上述一端且朝向上述另一端(20－10×(n－1))mm之位置至距離上述一端且朝向上述另一端(100－10×(n－1))mm的位置，於每隔2 mm間隔之41個地點測定厚度。將自距離一端(20－10×(n－1))mm之位置(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述壓接前之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成之內角設為於第n地點之部分楔角。 又，第1地點至第n地點為止之各部分楔角可統一地以如下方式顯現。上述壓接前之中間膜之從自上述一端起朝向上述另一端(10×A)mm之位置至距離上述一端且朝向上述另一端(80＋10×A)mm之位置，每隔2 mm測定41處之厚度(A為0以上之整數)。將自距離一端(10×A)mm之位置(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述壓接前之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成的內角設為於第1～第n各地點之部分楔角。 於正式壓接後之中間膜之每隔10 mm之各地點測定部分楔角之具體方法： 於上述正式壓接後之中間膜之每隔10 mm之各地點，部分楔角係以與在上述正式壓接前之中間膜之每隔10 mm之各地點測定部分楔角時相同之方式進行測定。 作為於上述正式壓接後之中間膜之每隔10 mm之各地點測定部分楔角時所使用之測定機器，可列舉非接觸多層膜厚測定器「OPTIGAUGE」(Metrics公司製造)等。於上述正式壓接後之部分楔角之測定中，可於積層體之狀態下測定正式壓接後之中間膜之厚度。 於第1地點求出部分楔角之方法係如下所示。於上述正式壓接後之中間膜之自上述一端之位置至距離上述一端且朝向上述另一端80 mm之位置，於每隔2 mm間隔之41個地點測定厚度。將自一端(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述正式壓接後之中間膜之厚度(單位μm)設為y軸，藉由最小平方法獲得一次直線。將所獲得之一次直線與y＝0之直線所成的內角設為於第1地點之部分楔角。 於第2地點求出部分楔角之方法係如下所示。於上述正式壓接後之中間膜之從自上述一端起朝向上述另一端10 mm之位置至距離上述一端且朝向上述另一端90 mm之位置，於每隔2 mm間隔之41個地點測定厚度。將自距離一端20 mm之位置(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述正式壓接後之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成之內角設為於第2地點之部分楔角。 (於第3地點～第n－1地點求出部分楔角之方法係省略) 於第n地點求出部分楔角之方法係如下所示。於上述正式壓接後之中間膜之從自上述一端起朝向上述另一端(20－10×(n－1))mm之位置至距離上述一端且朝向上述另一端(100－10×(n－1))mm之位置，於每隔2 mm間隔之41個地點測定厚度。將自距離一端(20－10×(n－1))mm之位置(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(單位mm)設為x軸，且將上述正式壓接後之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成之內角設為於第n地點之部分楔角。 又，第1地點至第n地點為止之各部分楔角可統一地以如下方式顯現。於上述正式壓接後之中間膜之從自上述一端起朝向上述另一端(10×A)mm之位置至距離上述一端且朝向上述另一端(80＋10×A)mm之位置，每隔2 mm測定41處之厚度(A為0以上之整數)。將自距離一端(10×A)mm之位置(設為x＝0 mm之位置)朝向另一端直至厚度之測定地點的距離(単位mm)設為x軸，且將上述正式壓接後之中間膜之厚度(單位μm)設為y軸，藉由最小平方法而獲得一次直線。將所獲得之一次直線與y＝0之直線所成之內角設為於第1～第n之各地點之部分楔角。 上述中間膜較佳為包括23℃下之彈性模數G'為4 MPa以上之層，更佳為包括23℃下之彈性模數G'為8 MPa以上之層，進而較佳為包括23℃下之彈性模數G'為20 MPa以上之層。若上述層之於23℃下之彈性模數G'為上述下限以上，則於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像。上述中間膜較佳為包括23℃下之彈性模數G'為4 MPa以上之層作為表面層，更佳為包括23℃下之彈性模數G'為8 MPa以上之層作為表面層，進而較佳為包括23℃下之彈性模數G'為20 MPa以上之層作為表面層。若作為表面層之上述層之於23℃下之彈性模數G'為上述下限以上，則於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像。23℃下之彈性模數G'為上述下限以上之層之上述23℃下之彈性模數G'亦可為55 Pa以下。 就於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像之觀點而言，本發明之中間膜較佳為以下之中間膜(1)，更佳為以下之中間膜(2)，進而較佳為以下之中間膜(3)。中間膜(1)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述一端與上述另一端間之中央位置為止的區域中，於隔開之2個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。中間膜(2)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述一端與上述另一端間之中央位置為止的區域中，於隔開之3個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。中間膜(3)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述一端與上述另一端間之中央位置為止的區域中，於隔開之4個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。於隔開之2個部位以上上述壓接前之中間膜與上述第2玻璃板接觸後，上述壓接前之中間膜與上述第2玻璃板之整體亦可面接觸直至壓接結束。 於隔開之複數個部位上述壓接前之中間膜與上述第2玻璃板接觸之情形時，隔開之距離(上述壓接前之中間膜與上述第2玻璃板未接觸之距離)可為1 μm以上，亦可為1 mm以上，亦可為10 mm以上，亦可為1 cm以上，亦可為10 cm以上。於表面經壓紋加工之中間膜中，上述隔開之距離一般不會成為1 mm以上，尤其是不會成為10 mm以上。上述壓接前之中間膜與上述第2玻璃板未接觸之距離係未接觸之每1個部位之距離。 再者，有如下情形，即依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述壓接前之中間膜之自上述一端之位置至上述一端與上述另一端間之中央位置為止的區域中，於隔開之2個部位以上，上述壓接前之中間膜與上述第2玻璃板接觸。於該情形時，上述壓接前之中間膜與上述第2玻璃板最初接觸之部位亦可為1個部位。只要在壓接進行且壓接完成之前，於隔開之2個部位以上，上述壓接前之中間膜與上述第2玻璃板接觸即可。 就於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像之觀點而言，本發明之中間膜較佳為以下之中間膜(2)。中間膜(2)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述另一端之位置為止的區域中，於隔開之3個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。於隔開之3個部位以上上述壓接前之中間膜與上述第2玻璃板接觸後，上述壓接前之中間膜與上述第2玻璃板之整體亦可面接觸直至壓接完成。 就於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像之觀點而言，本發明之中間膜較佳為以下之中間膜(4)，更佳為以下之中間膜(5)，進而較佳為以下之中間膜(6)。中間膜(4)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述壓接前之中間膜之自上述一端與上述另一端之間之中央位置至上述另一端之位置的區域內，成為上述壓接前之中間膜與上述第2玻璃板於隔開之4個部位以上未接觸之狀態。中間膜(5)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述壓接前之中間膜之自上述一端與上述另一端之間之中央位置至上述另一端之位置的區域內，成為上述壓接前之中間膜與上述第2玻璃板於隔開之3個部位以上未接觸之狀態。中間膜(6)係於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述壓接前之中間膜之自上述一端與上述另一端之間之中央位置至上述另一端之位置的區域內，成為上述壓接前之中間膜與上述第2玻璃板於隔開之2個部位以上未接觸之狀態。 本發明之中間膜亦可具有陰影區域。上述陰影區域亦可與顯示對應區域相離。上述陰影區域例如以防止因太陽光線或屋外照明等而使駕駛中之駕駛員感覺到晃眼等為目的而設置。上述陰影區域亦有為了賦予遮熱性而設置之情況。上述陰影區域較佳為位於中間膜之緣部。上述陰影區域較佳為帶狀。 於陰影區域中，亦可為了改變顏色及可見光透過率，而使用著色劑或填充劑。著色劑或填充劑亦可僅含於中間膜之厚度方向之一部分區域中，亦可含於中間膜之厚度方向之整體區域中。 本發明之中間膜例如具有與抬頭顯示器之顯示區域對應之顯示對應區域。上述顯示對應區域係可良好地顯示資訊之區域。 就使顯示進一步良好，進一步擴大視野之觀點而言，上述顯示對應區域之可見光透過率較佳為80%以上，更佳為88%以上，進而較佳為90%以上。上述顯示對應區域之可見光透過率較佳為高於上述陰影區域之可見光透過率。上述顯示對應區域之可見光透過率亦可低於上述陰影區域之可見光透過率。上述顯示對應區域之可見光透過率較上述陰影區域之可見光透過率，較佳為高50%以上，更佳為高60%以上。 再者，例如於顯示對應區域及陰影區域之中間膜中，可見光透過率產生變化之情形時，於顯示對應區域之中心位置及陰影區域之中心位置測定可見光透過率。 可使用分光光度計(日立高新技術公司製造之「U-4100」)，並依據JIS R3211(1998)而測定所獲得之層合玻璃之於波長380～780 nm下之上述可見光透過率。再者，較佳為使用厚度2 mm之透明玻璃作為玻璃板。 上述顯示對應區域較佳為具有長度方向與寬度方向。由於中間膜之通用性優異，故而上述顯示對應區域之寬度方向較佳為將上述一端與上述另一端連結之方向。上述顯示對應區域較佳為帶狀。 上述中間膜較佳為具有MD方向與TD方向。中間膜例如藉由熔融擠壓成形而獲得。MD方向係中間膜之製造時之中間膜之行進方向。TD方向係與中間膜之製造時之中間膜之行進方向正交的方向，且係與中間膜之厚度方向正交之方向。上述一端與上述另一端較佳為位於TD方向之兩側。 就使顯示進一步良好之觀點而言，中間膜較佳為具有厚度方向之剖面形狀為楔狀之部分。較佳為顯示對應區域之厚度方向之剖面形狀為楔狀。 以下，一面參照圖式，一面說明本發明之具體實施形態。 圖1(a)及(b)係模式性地表示本發明之第1實施形態之層合玻璃用中間膜之剖視圖及前視圖。圖1(a)係沿著圖1(b)中之I-I線之剖視圖。再者，關於圖1及下述之圖中之中間膜之大小及尺寸，為了方便圖示，而自實際之大小及形狀適當變更。 於圖1(a)中，顯示出中間膜11之厚度方向之剖面。再者，於圖1(a)及下述之圖中，為了方便圖示，中間膜及構成中間膜之各層之厚度、以及楔角(θ)係以與實際之厚度及楔角不同之方式顯示。 中間膜11包括第1層1(中間層)、第2層2(表面層)、及第3層3(表面層)。於第1層1之第1表面側配置並積層有第2層2。於第1層1之與第1表面相反之第2表面側配置並積層有第3層3。第1層1係配置並挾入至第2層2與第3層3之間。中間膜11係用以獲得層合玻璃。中間膜11係層合玻璃用中間膜。中間膜11係多層中間膜。 中間膜11具有一端11a、及一端11a之相反側之另一端11b。一端11a與另一端11b係相對向之兩側之端部。第2層2及第3層3之厚度方向之剖面形狀為楔狀。第1層1之厚度方向之剖面形狀為矩形。第2層2及第3層3之厚度係另一端11b側大於一端11a側。因此，中間膜11之另一端11b之厚度大於一端11a之厚度。因此，中間膜11具有厚度較薄之區域、與厚度較厚之區域。 中間膜11具有自一端11a側至另一端11b側厚度增加之區域。中間膜11係於厚度增加之區域中，自一端11a側至另一端11b側厚度之增加量不同。相對於中間膜11之一表面，中間膜11之另一表面之斜率於中間膜11整體中並不一定。中間膜11實際上於表面具有凹部或凸部，但由於凹部或凸部相對較小，故而於圖1中並未顯示。 中間膜11具有與抬頭顯示器之顯示區域對應之顯示對應區域R1。中間膜11係於顯示對應區域R1之附近具有周圍區域R2。 中間膜11具有與顯示對應區域R1分離之陰影區域R3。陰影區域R3係位於中間膜11之緣部。 中間膜係圖1(a)所示之形狀，且可為單層，亦可為2層，亦可為4層以上。 圖4係模式性地表示捲繞圖1所示之層合玻璃用中間膜而成之輥體之立體圖。 亦可捲繞中間膜11而製成中間膜11之輥體51。 圖4所示之輥體51包括捲芯61、及中間膜11。中間膜11係捲繞於捲芯61之外周。 圖2(a)及(b)係模式性地表示本發明之第2實施形態之層合玻璃用中間膜之剖視圖及前視圖。圖2(a)係沿著圖2(b)中之I-I線之剖視圖。於圖2(a)中，顯示中間膜11A之厚度方向之剖面。 圖2所示之中間膜11A包括第1層1A。中間膜11A具有僅第1層1A之1層結構，係單層之中間膜。中間膜11A係第1層1A。中間膜11A係用以獲得層合玻璃。中間膜11A係層合玻璃用中間膜。 中間膜11A具有一端11a、及一端11a之相反側之另一端11b。一端11a與另一端11b係相對向之兩側之端部。中間膜11A之另一端11b之厚度大於一端11a之厚度。因此，中間膜11A及第1層1A具有厚度較薄之區域、與厚度較厚之區域。 中間膜11A具有自一端11a側至另一端11b側厚度增加之區域。中間膜11A係於厚度增加之區域中自一端11a側至另一端11b側厚度之增加量不同。中間膜11A係於厚度增加之區域中自一端11a側至另一端11b側厚度之增加量不同。相對於中間膜11A之一表面，中間膜11A之另一表面之斜率於中間膜11A整體中並不一定。中間膜11A實際上於表面具有凹部或凸部，但由於凹部或凸部相對較小，故而於圖2中並未顯示。 中間膜11A及第1層1A具有厚度方向之剖面形狀為矩形之部分11Aa、1Aa、及厚度方向之剖面形狀為楔狀之部分11Ab、1Ab。 中間膜11A具有與抬頭顯示器之顯示區域對應之顯示對應區域R1。中間膜11A係於顯示對應區域R1之周圍具有周圍區域R2。 中間膜11A具有與顯示對應區域R1分離之陰影區域R3。陰影區域R3係位於中間膜11A之緣部。 中間膜係圖2(a)所示之形狀，且亦可為2層以上。 上述中間膜較佳為具有厚度方向之剖面形狀為楔狀之部分。上述中間膜較佳為具有自一端向另一端厚度逐漸變大之部分。中間膜之厚度方向之剖面形狀較佳為楔狀。作為中間膜之厚度方向之剖面形狀，可列舉：梯形、三角形及五角形等。 就進一步抑制雙重影像之觀點而言，中間膜較佳為具有於厚度增加之區域中自一端側至另一端側厚度之增加量變大之部分。就進一步抑制雙重影像之觀點而言，中間膜較佳為具有於厚度方向之剖面形狀為楔狀之區域中自一端側至另一端側楔角變大之部分。 為了抑制雙重影像，可視層合玻璃之安裝角度而適當設定中間膜之楔角(θ)。楔角(θ)係中間膜整體中之楔角。就進一步抑制雙重影像之觀點而言，中間膜之楔角(θ)較佳為0.1 mrad(0.00575度)以上，更佳為0.2 mrad(0.0115度)以上。又，若上述楔角θ為上述下限以上，則可獲得適於軌道或公共汽車等擋風玻璃之安裝角度較大之車輛之層合玻璃。 就進一步抑制雙重影像之觀點而言，中間膜之楔角θ較佳為2 mrad(0.1146度)以下，更佳為0.7 mrad(0.0401度)以下。又，若上述楔角θ為上述上限以下，則可獲得運動型汽車等擋風玻璃之安裝角度較小之車輛之層合玻璃。 上述中間膜之楔角(θ)係中間膜中之將最大厚度部分與最小厚度部分之中間膜之一側之表面部分(第1表面部分)連結的直線、與中間膜中之將最大厚度部分與最小厚度部分之中間膜之另一側之表面部分(第2表面部分)連結的直線之交點上之內角。 再者，於最大厚度部分有複數個，最小厚度部分有複數個，最大厚度部分存在於一定區域內，或最小厚度部分存在於一定區域內之情形時，用以求出楔角θ之最大厚度部分及最小厚度部分係以所求出之楔角θ成為最大之方式進行選擇。 上述中間膜之厚度並無特別限定。上述中間膜之厚度係顯示構成中間膜之各層之合計厚度。因此，於多層之中間膜11之情形時，該中間膜之厚度係顯示第1層1、第2層2、及第3層3之合計厚度。 中間膜之最大厚度較佳為0.1 mm以上，更佳為0.25 mm以上，進而較佳為0.5 mm以上，尤佳為0.8 mm以上，且較佳為3 mm以下，更佳為2 mm以下，進而較佳為1.5 mm以下。 將一端與另一端之間之距離設為X。中間膜較佳為於距離一端且朝向內側0X～0.2X之距離之區域具有最小厚度，且於距離另一端且朝向內側0X～0.2X之距離之區域具有最大厚度。中間膜更佳為於距離一端且朝向內側0X～0.1X之距離之區域具有最小厚度，且於距離另一端且朝向內側0X～0.1X之距離之區域具有最大厚度。中間膜較佳為於一端具有最小厚度，中間膜較佳為於另一端具有最大厚度。 中間膜11、11A係於另一端11b具有最大厚度，於一端11a具有最小厚度。 上述中間膜亦可具有厚度均一部位。所謂上述厚度均一部位，係指將中間膜之上述一端與上述另一端連結之方向上之每10 cm距離範圍，厚度變化未超過10 μm。因此，上述厚度均一部位係將中間膜之上述一端與上述另一端連結之方向上之每10 cm距離範圍，厚度變化未超過10 μm之部位。具體而言，上述厚度均一部位係如下部位，即於將中間膜之上述一端與上述另一端連結之方向上厚度完全未變化、或者於將中間膜之上述一端與上述另一端連結之方向上之每10 cm距離範圍，厚度變化為10 μm以下。 就實用方面之觀點、以及充分提高接著力及耐貫通性之觀點而言，表面層之最大厚度較佳為0.001 mm以上，更佳為0.2 mm以上，進而較佳為0.3 mm以上，且較佳為1 mm以下，更佳為0.8 mm以下。 就實用方面之觀點、以及充分提高耐貫通性之觀點而言，配置於2個表面層之間之層(中間層)之最大厚度較佳為0.001 mm以上，更佳為0.1 mm以上，進而較佳為0.2 mm以上，且較佳為0.8 mm以下，更佳為0.6 mm以下，進而較佳為0.3 mm以下。 上述中間膜之一端與另一端之距離X較佳為3 m以下，更佳為2 m以下，尤佳為1.5 m以下，且較佳為0.5 m以上，更佳為0.8 m以上，尤佳為1 m以上。 以下，對多層之中間膜之各層、以及構成單層之中間膜之材料之詳細內容進行說明。 (樹脂) 中間膜較佳為含有樹脂。上述樹脂可僅使用1種，亦可將2種以上併用。 作為上述樹脂，可列舉：熱硬化性樹脂及熱塑性樹脂。 中間膜較佳為含有樹脂(以下，有時記載為樹脂(0))。中間膜較佳為含有熱塑性樹脂(以下，有時記載為熱塑性樹脂(0))。中間膜較佳為含有聚乙烯縮醛樹脂(以下，有時記載為聚乙烯縮醛樹脂(0))作為熱塑性樹脂(0)。上述第1層較佳為含有樹脂(以下，有時記載為樹脂(1))。上述第1層較佳為含有熱塑性樹脂(以下，有時記載為熱塑性樹脂(1))。上述第1層較佳為含有聚乙烯縮醛樹脂(以下，有時記載為聚乙烯縮醛樹脂(1))作為熱塑性樹脂(1)。上述第2層較佳為含有樹脂(以下，有時記載為樹脂(2))。上述第2層較佳為含有熱塑性樹脂(以下，有時記載為熱塑性樹脂(2))。上述第2層較佳為含有聚乙烯縮醛樹脂(以下，有時記載為聚乙烯縮醛樹脂(2))作為熱塑性樹脂(2)。上述第3層較佳為含有樹脂(以下，有時記載為樹脂(3))。上述第3層較佳為含有熱塑性樹脂(以下，有時記載為熱塑性樹脂(3))。上述第3層較佳為含有聚乙烯縮醛樹脂(以下，有時記載為聚乙烯縮醛樹脂(3))作為熱塑性樹脂(3)。上述樹脂(1)、上述樹脂(2)及上述樹脂(3)可相同，亦可不同。就遮音性進一步變高之方面而言，上述樹脂(1)較佳為與上述樹脂(2)及上述樹脂(3)不同。上述熱塑性樹脂(1)、上述熱塑性樹脂(2)及上述熱塑性樹脂(3)可相同，亦可不同。就遮音性進一步變高之方面而言，上述熱塑性樹脂(1)較佳為與上述熱塑性樹脂(2)及上述熱塑性樹脂(3)不同。上述聚乙烯縮醛樹脂(1)、上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)可相同，亦可不同。就遮音性進一步變高之方面而言，上述聚乙烯縮醛樹脂(1)較佳為與上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)不同。上述熱塑性樹脂(0)、上述熱塑性樹脂(1)、上述熱塑性樹脂(2)及上述熱塑性樹脂(3)分別可僅使用1種，亦可將2種以上併用。上述聚乙烯縮醛樹脂(0)、上述聚乙烯縮醛樹脂(1)、上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)分別可僅使用1種，亦可將2種以上併用。 作為上述熱塑性樹脂，可列舉：聚乙烯縮醛樹脂、聚酯樹脂、乙烯-乙酸乙烯酯共聚物樹脂、乙烯-丙烯酸共聚物樹脂、聚胺基甲酸酯樹脂及聚乙烯醇樹脂等。亦可使用該等以外之熱塑性樹脂。再者，聚甲醛(或聚縮醛)樹脂係包含於聚乙烯縮醛樹脂中。 上述樹脂較佳為熱塑性樹脂。上述熱塑性樹脂更佳為聚乙烯縮醛樹脂或聚酯樹脂，進而較佳為聚乙烯縮醛樹脂。藉由併用聚乙烯縮醛樹脂與塑化劑，本發明之中間膜對於層合玻璃構件或其他中間膜之接著力進一步變高。上述聚乙烯縮醛樹脂較佳為聚乙烯縮丁醛樹脂。 上述聚乙烯縮醛樹脂例如可藉由利用醛使聚乙烯醇(PVA)縮醛化而製造。上述聚乙烯縮醛樹脂較佳為聚乙烯醇之縮醛化物。上述聚乙烯醇例如藉由將聚乙酸乙烯酯皂化而獲得。上述聚乙烯醇之皂化度一般為70～99.9莫耳%之範圍內。 上述聚乙烯醇(PVA)之平均聚合度較佳為200以上，更佳為500以上，進而更佳為1500以上，進而更佳為1600以上，尤佳為2600以上，最佳為2700以上，且較佳為5000以下，更佳為4000以下，進而較佳為3500以下。若上述平均聚合度為上述下限以上，則層合玻璃之耐貫通性進一步變高。若上述平均聚合度為上述上限以下，則中間膜之成形變容易。 上述聚乙烯醇之平均聚合度係藉由依據JIS K6726「聚乙烯醇試驗方法」之方法而求出。 上述聚乙烯縮醛樹脂所含之縮醛基之碳數並無特別限定。製造上述聚乙烯縮醛樹脂時所使用之醛並無特別限定。上述聚乙烯縮醛樹脂中之縮醛基之碳數較佳為3～5，更佳為3或4。若上述聚乙烯縮醛樹脂中之縮醛基之碳數為3以上，則中間膜之玻璃轉移溫度充分地變低。上述聚乙烯縮醛樹脂中之縮醛基之碳數亦可為4或5。 上述醛並無特別限定。一般而言，可較佳地使用碳數為1～10之醛。作為上述碳數為1～10之醛，例如可列舉：甲醛、乙醛、丙醛、正丁醛、異丁醛、正戊醛、2-乙基丁醛、正己醛、正辛醛、正壬醛、正癸醛及苯甲醛等。較佳為丙醛、正丁醛、異丁醛、正己醛或正戊醛，更佳為丙醛、正丁醛或異丁醛，進而較佳為正丁醛。上述醛可僅使用1種，亦可將2種以上併用。 上述聚乙烯縮醛樹脂(0)之羥基之含有率(羥基量)較佳為15莫耳%以上，更佳為18莫耳%以上，且較佳為40莫耳%以下，更佳為35莫耳%以下。若上述羥基之含有率為上述下限以上，則中間膜之接著力進一步變高。又，若上述羥基之含有率為上述上限以下，則中間膜之柔軟性變高，中間膜之處理變容易。 上述聚乙烯縮醛樹脂(1)之羥基之含有率(羥基量)較佳為17莫耳%以上，更佳為20莫耳%以上，進而較佳為22莫耳%以上。上述聚乙烯縮醛樹脂(1)之羥基之含有率(羥基量)較佳為30莫耳%以下，更佳為28莫耳%以下，進而更佳為27莫耳%以下，進而更佳為25莫耳%以下，尤佳為未達25莫耳%，最佳為24莫耳%以下。若上述羥基之含有率為上述下限以上，則中間膜之機械強度進一步變高。尤其是若上述聚乙烯縮醛樹脂(1)之羥基之含有率為20莫耳%以上，則反應效率較高，生產性優異，又，若為28莫耳%以下，則層合玻璃之遮音性進一步變高，若為28莫耳%以下，則遮音性進一步變高。又，若上述羥基之含有率為上述上限以下，則中間膜之柔軟性變高，中間膜之處理變容易。 上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)之羥基之各含有率較佳為25莫耳%以上，更佳為28莫耳%以上，更佳為30莫耳%以上，進而更佳為超過31莫耳%，進而較佳為31.5莫耳%以上，進而較佳為32莫耳%以上，尤佳為33莫耳%以上。上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)之羥基之各含有率較佳為38莫耳%以下，更佳為37莫耳%以下，進而較佳為36.5莫耳%以下，尤佳為36莫耳%以下。若上述羥基之含有率為上述下限以上，則中間膜之接著力進一步變高。又，若上述羥基之含有率為上述上限以下，則中間膜之柔軟性變高，中間膜之處理變容易。 就進一步提高遮音性之觀點而言，上述聚乙烯縮醛樹脂(1)之羥基之含有率較佳為低於上述聚乙烯縮醛樹脂(2)之羥基之含有率。就進一步提高遮音性之觀點而言，上述聚乙烯縮醛樹脂(1)之羥基之含有率較佳為低於上述聚乙烯縮醛樹脂(3)之羥基之含有率。就進一步提高遮音性之觀點而言，上述聚乙烯縮醛樹脂(1)之羥基之含有率、與上述聚乙烯縮醛樹脂(2)之羥基之含有率之差的絕對值較佳為1莫耳%以上，更佳為5莫耳%以上，進而較佳為9莫耳%以上，尤佳為10莫耳%以上，最佳為12莫耳%以上。就進一步提高遮音性之觀點而言，上述聚乙烯縮醛樹脂(1)之羥基之含有率、與上述聚乙烯縮醛樹脂(3)之羥基之含有率之差的絕對值較佳為1莫耳%以上，更佳為5莫耳%以上，進而較佳為9莫耳%以上，尤佳為10莫耳%以上，最佳為12莫耳%以上。上述聚乙烯縮醛樹脂(1)之羥基之含有率、與上述聚乙烯縮醛樹脂(2)之羥基之含有率之差的絕對值較佳為20莫耳%以下。上述聚乙烯縮醛樹脂(1)之羥基之含有率、與上述聚乙烯縮醛樹脂(3)之羥基之含有率之差的絕對值較佳為20莫耳%以下。 關於上述聚乙烯縮醛樹脂之羥基之含有率，係以百分率表示用鍵結有羥基之伸乙基量除以主鏈之總伸乙基量而求出之莫耳分率之值。上述鍵結有羥基之伸乙基量例如可依據JIS K6728「聚乙烯縮丁醛試驗方法」進行測定。 上述聚乙烯縮醛樹脂(0)之乙醯化度(乙醯基量)較佳為0.1莫耳%以上，更佳為0.3莫耳%以上，進而較佳為0.5莫耳%以上，且較佳為30莫耳%以下，更佳為25莫耳%以下，進而較佳為20莫耳%以下。若上述乙醯化度為上述下限以上，則聚乙烯縮醛樹脂與塑化劑之相容性變高。若上述乙醯化度為上述上限以下，則中間膜及層合玻璃之耐濕性變高。 上述聚乙烯縮醛樹脂(1)之乙醯化度(乙醯基量)較佳為0.01莫耳%以上，更佳為0.1莫耳%以上，進而較佳為7莫耳%以上，進而較佳為9莫耳%以上，且較佳為30莫耳%以下，更佳為25莫耳%以下，進而較佳為24莫耳%以下，尤佳為20莫耳%以下。若上述乙醯化度為上述下限以上，則聚乙烯縮醛樹脂與塑化劑之相容性變高。若上述乙醯化度為上述上限以下，則中間膜及層合玻璃之耐濕性變高。尤其是若上述聚乙烯縮醛樹脂(1)之乙醯化度為0.1莫耳%以上且25莫耳%以下，則耐貫通性優異。 上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)之各乙醯化度較佳為0.01莫耳%以上，更佳為0.5莫耳%以上，且較佳為10莫耳%以下，更佳為2莫耳%以下。若上述乙醯化度為上述下限以上，則聚乙烯縮醛樹脂與塑化劑之相容性變高。若上述乙醯化度為上述上限以下，則中間膜及層合玻璃之耐濕性變高。 上述乙醯化度係以百分率表示用鍵結有乙醯基之伸乙基量除以主鏈之總伸乙基量而求出之莫耳分率之值。上述鍵結有乙醯基之伸乙基量例如可依據JIS K6728「聚乙烯縮丁醛試驗方法」而進行測定。 上述聚乙烯縮醛樹脂(0)之縮醛化度(於聚乙烯縮丁醛樹脂之情形時為丁醛化度)較佳為60莫耳%以上，更佳為63莫耳%以上，且較佳為85莫耳%以下，更佳為75莫耳%以下，進而較佳為70莫耳%以下。若上述縮醛化度為上述下限以上，則聚乙烯縮醛樹脂與塑化劑之相容性變高。若上述縮醛化度為上述上限以下，則製造聚乙烯縮醛樹脂所需要之反應時間變短。 上述聚乙烯縮醛樹脂(1)之縮醛化度(於聚乙烯縮丁醛樹脂之情形時為丁醛化度)較佳為47莫耳%以上，更佳為60莫耳%以上，且較佳為85莫耳%以下，更佳為80莫耳%以下，進而較佳為75莫耳%以下。若上述縮醛化度為上述下限以上，則聚乙烯縮醛樹脂與塑化劑之相容性變高。若上述縮醛化度為上述上限以下，則製造聚乙烯縮醛樹脂所需要之反應時間變短。 上述聚乙烯縮醛樹脂(2)及上述聚乙烯縮醛樹脂(3)之各縮醛化度(於聚乙烯縮丁醛樹脂之情形時為丁醛化度)較佳為55莫耳%以上，更佳為60莫耳%以上，且較佳為75莫耳%以下，更佳為71莫耳%以下。若上述縮醛化度為上述下限以上，則聚乙烯縮醛樹脂與塑化劑之相容性變高。若上述縮醛化度為上述上限以下，則製造聚乙烯縮醛樹脂所需要之反應時間變短。 上述縮醛化度係以如下方式求出。首先，求出自主鏈之總伸乙基量減去鍵結有羥基之伸乙基量、及鍵結有乙醯基之伸乙基量所獲得之值。用所獲得之值除以主鏈之總伸乙基量而求出莫耳分率。以百分率表示該莫耳分率之值為縮醛化度。 再者，上述羥基之含有率(羥基量)、縮醛化度(丁醛化度)及乙醯化度較佳為自藉由依據JIS K6728「聚乙烯縮丁醛試驗方法」之方法所測得之結果算出。其中，亦可使用基於ASTM D1396-92之測定。於聚乙烯縮醛樹脂為聚乙烯縮丁醛樹脂之情形時，上述羥基之含有率(羥基量)、上述縮醛化度(丁醛化度)及上述乙醯化度可自藉由依據JIS K6728「聚乙烯縮丁醛試驗方法」之方法所測得之結果算出。 (塑化劑) 就進一步提高中間膜之接著力之觀點而言，本發明之中間膜較佳為含有塑化劑(以下，有時記載為塑化劑(0))。上述第1層較佳為含有塑化劑(以下，有時記載為塑化劑(1))。上述第2層較佳為含有塑化劑(以下，有時記載為塑化劑(2))。上述第3層較佳為含有塑化劑(以下，有時記載為塑化劑(3))。於中間膜所含之熱塑性樹脂為聚乙烯縮醛樹脂之情形時，中間膜(各層)尤佳為含有塑化劑。含有聚乙烯縮醛樹脂之層較佳為含有塑化劑。 上述塑化劑並無特別限定。作為上述塑化劑，可使用先前公知之塑化劑。上述塑化劑可僅使用1種，亦可將2種以上併用。 作為上述塑化劑，可列舉：一元有機酸酯及多元有機酸酯等有機酯塑化劑、以及有機磷酸塑化劑及有機亞磷酸塑化劑等有機磷酸塑化劑等。較佳為有機酯塑化劑。上述塑化劑較佳為液狀塑化劑。 作為上述一元有機酸酯，可列舉：藉由二醇與一元有機酸之反應而獲得之二醇酯等。作為上述二醇，可列舉：三乙二醇、四乙二醇及三丙二醇等。作為上述一元有機酸，可列舉：丁酸、異丁酸、己酸、2-乙基丁酸、庚酸、正辛酸、2-乙基己酸、正壬酸、癸酸及苯甲酸等。 作為上述多元有機酸酯，可列舉：多元有機酸、與具有碳數4～8之直鏈或支鏈結構之醇之酯化合物等。作為上述多元有機酸，可列舉：己二酸、癸二酸及壬二酸等。 作為上述有機酯塑化劑，可列舉：三乙二醇二(2-乙基丙酸酯)、三乙二醇二(2-乙基丁酸酯)、三乙二醇二(2-乙基己酸酯)、三乙二醇二辛酸酯、三乙二醇二正辛酸酯、三乙二醇二正庚酸酯、四乙二醇二正庚酸酯、癸二酸二丁酯、癸二酸二辛酯、二丁基卡必醇己二酸酯、乙二醇二(2-乙基丁酸酯)、1,3-丙二醇二(2-乙基丁酸酯)、1,4-丁二醇二(2-乙基丁酸酯)、二乙二醇二(2-乙基丁酸酯)、二乙二醇二(2-乙基己酸酯)、二丙二醇二(2-乙基丁酸酯)、三乙二醇二(2-乙基戊酸酯)、四乙二醇二(2-乙基丁酸酯)、二乙二醇二辛酸酯、二乙二醇二苯甲酸酯、二丙二醇二苯甲酸酯、己二酸二己酯、己二酸二辛酯、己二酸己酯環己酯、己二酸庚酯與己二酸壬酯之混合物、己二酸二異壬酯、己二酸二異癸酯、己二酸庚酯壬酯、癸二酸二丁酯、油改性癸二酸醇酸、及磷酸酯與己二酸酯之混合物等。亦可使用該等以外之有機酯塑化劑。亦可使用上述之己二酸酯以外之其他己二酸酯。 作為上述有機磷酸塑化劑，可列舉：磷酸三丁氧基乙酯、磷酸異癸酯苯酯及磷酸三異丙酯等。 上述塑化劑較佳為下述式(1)所表示之二酯塑化劑。 [化1]

Figure 02_image001
上述式(1)中，R1及R2分別表示碳數5～10之有機基，R3表示伸乙基、伸異丙基或伸正丙基，p表示3～10之整數。上述式(1)中之R1及R2分別較佳為碳數6～10之有機基。 上述塑化劑較佳為含有三乙二醇二(2-乙基己酸酯)(3GO)、三乙二醇二(2-乙基丁酸酯)(3GH)或三乙二醇二(2-乙基丙酸酯)。上述塑化劑更佳為含有三乙二醇二(2-乙基己酸酯)(3GO)或三乙二醇二(2-乙基丁酸酯)(3GH)，進而較佳為含有三乙二醇二(2-乙基己酸酯)。 就於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像之觀點而言，本發明之中間膜較佳為具備含有熱塑性樹脂、及相對於上述熱塑性樹脂100重量份為25重量份以上且45重量份以下之含量之塑化劑之層。於該情形時，含有熱塑性樹脂與塑化劑之層中之塑化劑之含量更佳為35重量份以下，進而較佳為32重量份以下，尤佳為30重量份以下。 於上述中間膜中，將上述塑化劑(0)相對於上述樹脂(0)100重量份(於上述樹脂(0)為熱塑性樹脂(0)之情形時為上述熱塑性樹脂(0)100重量份；於上述樹脂(0)為聚乙烯縮醛樹脂(0)之情形時為上述聚乙烯縮醛樹脂(0)100重量份)之含量設為含量(0)。上述含量(0)較佳為25重量份以上，更佳為30重量份以上，且較佳為100重量份以下，更佳為60重量份以下，進而較佳為50重量份以下。若上述塑化劑(0)之含量為上述下限以上，則層合玻璃之耐貫通性進一步變高。若上述塑化劑(0)之含量為上述上限以下，則中間膜之透明性進一步變高。進而，若上述塑化劑(0)之含量為上述下限以上及上述上限以下，則於製作層合玻璃時可進一步有效地抑制部分楔角之變化，而進一步有效地抑制層合玻璃中之雙重影像。 於上述第1層中，將上述塑化劑(1)相對於上述樹脂(1)100重量份(於上述樹脂(1)為熱塑性樹脂(1)之情形時，上述熱塑性樹脂(1)100重量份；於上述樹脂(1)為聚乙烯縮醛樹脂(1)之情形時，上述聚乙烯縮醛樹脂(1)100重量份)之含量設為含量(1)。上述含量(1)較佳為50重量份以上，更佳為55重量份以上，進而較佳為60重量份以上，且較佳為100重量份以下，更佳為90重量份以下，進而較佳為85重量份以下，尤佳為80重量份以下。若上述含量(1)為上述下限以上，則中間膜之柔軟性變高，中間膜之處理變容易。若上述含量(1)為上述上限以下，則層合玻璃之耐貫通性進一步變高。 於上述第2層中，將上述塑化劑(2)相對於上述樹脂(2)100重量份(於上述樹脂(2)為熱塑性樹脂(2)之情形時，上述熱塑性樹脂(2)100重量份；於上述樹脂(2)為聚乙烯縮醛樹脂(2)之情形時，上述聚乙烯縮醛樹脂(2)100重量份)之含量設為含量(2)。於上述第3層中，將上述塑化劑(3)相對於上述樹脂(3)100重量份(於上述樹脂(3)為熱塑性樹脂(3)之情形時，上述熱塑性樹脂(3)100重量份；於上述樹脂(3)為聚乙烯縮醛樹脂(3)之情形時，上述聚乙烯縮醛樹脂(3)100重量份)之含量設為含量(3)。上述含量(2)及上述含量(3)分別較佳為10重量份以上，更佳為15重量份以上，進而較佳為20重量份以上，尤佳為24重量份以上，最佳為25重量份以上。上述含量(2)及上述含量(3)分別較佳為45重量份以下，更佳為40重量份以下，進而較佳為35重量份以下，尤佳為32重量份以下，最佳為30重量份以下。若上述含量(2)及上述含量(3)為上述下限以上，則中間膜之柔軟性變高，中間膜之處理變容易。若上述含量(2)及上述含量(3)為上述上限以下，則層合玻璃之耐貫通性進一步變高。 為了提高層合玻璃之遮音性，上述含量(1)較佳為多於上述含量(2)，上述含量(1)較佳為多於上述含量(3)。 就進一步提高層合玻璃之遮音性之觀點而言，上述含量(2)與上述含量(1)之差之絕對值、以及上述含量(3)與上述含量(1)之差之絕對值分別較佳為10重量份以上，更佳為15重量份以上，進而較佳為20重量份以上。上述含量(2)與上述含量(1)之差之絕對值、以及上述含量(3)與上述含量(1)之差之絕對值分別較佳為80重量份以下，更佳為75重量份以下，進而較佳為70重量份以下。 (遮熱性物質) 上述中間膜較佳為含有遮熱性物質。上述第1層較佳為含有遮熱性物質。上述第2層較佳為含有遮熱性物質。上述第3層較佳為含有遮熱性物質。上述遮熱性物質可僅使用1種，亦可將2種以上併用。 上述遮熱性物質較佳為含有酞菁化合物、萘酞菁化合物及蒽酞菁化合物中之至少1種成分X，或者包含遮熱粒子。於該情形時，亦可包含上述成分X與上述遮熱粒子兩者。 成分X： 上述中間膜較佳為含有酞菁化合物、萘酞菁化合物及蒽酞菁化合物中之至少1種成分X。上述第1層較佳為含有上述成分X。上述第2層較佳為含有上述成分X。上述第3層較佳為含有上述成分X。上述成分X為遮熱性物質。上述成分X可僅使用1種，亦可將2種以上併用。 上述成分X並無特別限定。作為成分X，可使用先前公知之酞菁化合物、萘酞菁化合物及蒽酞菁化合物。 作為上述成分X，可列舉：酞菁、酞菁之衍生物、萘酞菁、萘酞菁之衍生物、蒽酞菁及蒽酞菁之衍生物等。上述酞菁化合物及上述酞菁之衍生物分別較佳為具有酞菁骨架。上述萘酞菁化合物及上述萘酞菁之衍生物分別較佳為具有萘酞菁骨架。上述蒽酞菁化合物及上述蒽酞菁之衍生物分別較佳為具有蒽酞菁骨架。 就進一步提高中間膜及層合玻璃之遮熱性之觀點而言，上述成分X較佳為選自由酞菁、酞菁之衍生物、萘酞菁及萘酞菁之衍生物所組成之群中之至少1種，更佳為酞菁及酞菁之衍生物中之至少1種。 就有效地提高遮熱性，且持續長期以進一步高等級維持可見光透過率之觀點而言，上述成分X較佳為含有釩原子或銅原子。上述成分X較佳為含有釩原子，亦較佳為含有銅原子。上述成分X更佳為含有釩原子或銅原子之酞菁及含有釩原子或銅原子之酞菁之衍生物中之至少1種。就更進一步提高中間膜及層合玻璃之遮熱性之觀點而言，上述成分X較佳為具有於釩原子上鍵結有氧原子之結構單元。 上述中間膜100重量%中或包含上述成分X之層(第1層、第2層或第3層)100重量%中，上述成分X之含量較佳為0.001重量%以上，更佳為0.005重量%以上，進而較佳為0.01重量%以上，尤佳為0.02重量%以上。上述中間膜100重量%中或包含上述成分X之層(第1層、第2層或第3層)100重量%中，上述成分X之含量較佳為0.2重量%以下，更佳為0.1重量%以下，進而較佳為0.05重量%以下，尤佳為0.04重量%以下。若上述成分X之含量為上述下限以上及上述上限以下，則遮熱性充分地變高，且可見光透過率充分地變高。例如，可使可見光透過率為70%以上。 遮熱粒子： 上述中間膜較佳為含有遮熱粒子。上述第1層較佳為含有上述遮熱粒子。上述第2層較佳為含有上述遮熱粒子。上述第3層較佳為含有上述遮熱粒子。上述遮熱粒子為遮熱性物質。藉由使用遮熱粒子，可有效地遮斷紅外線(熱線)。上述遮熱粒子可僅使用1種，亦可將2種以上併用。 就進一步提高層合玻璃之遮熱性之觀點而言，上述遮熱粒子更佳為金屬氧化物粒子。上述遮熱粒子較佳為藉由金屬之氧化物所形成之粒子(金屬氧化物粒子)。 較可見光長之波長780 nm以上之紅外線與紫外線相比，能量較小。然而，紅外線之熱作用較大，若紅外線被物質吸收，則以熱之形式釋出。因此，紅外線一般稱為熱線。藉由使用上述遮熱粒子，可有效地遮斷紅外線(熱線)。再者，所謂遮熱粒子，意指可吸收紅外線之粒子。 作為上述遮熱粒子之具體例，可列舉：摻鋁氧化錫粒子、摻銦氧化錫粒子、摻銻氧化錫粒子(ATO粒子)、摻鎵氧化鋅粒子(GZO粒子)、摻銦氧化鋅粒子(IZO粒子)、摻鋁氧化鋅粒子(AZO粒子)、摻鈮氧化鈦粒子、摻鈉氧化鎢粒子、摻銫氧化鎢粒子、摻鉈氧化鎢粒子、摻銣氧化鎢粒子、摻錫氧化銦粒子(ITO粒子)、摻錫氧化鋅粒子、摻矽氧化鋅粒子等金屬氧化物粒子、或六硼化鑭(LaB6 )粒子等。亦可使用該等以外之遮熱粒子。金屬氧化物粒子由於熱線之遮蔽功能較高，故而較佳，更佳為ATO粒子、GZO粒子、IZO粒子、ITO粒子或氧化鎢粒子，尤佳為ITO粒子或氧化鎢粒子。尤其是摻錫氧化銦粒子(ITO粒子)由於熱線之遮蔽功能較高，且獲取容易，故而較佳，亦較佳為氧化鎢粒子。 就進一步提高中間膜及層合玻璃之遮熱性之觀點而言，氧化鎢粒子較佳為摻金屬氧化鎢粒子。於上述「氧化鎢粒子」中包含摻金屬氧化鎢粒子。作為上述摻金屬氧化鎢粒子，具體而言，可列舉：摻鈉氧化鎢粒子、摻銫氧化鎢粒子、摻鉈氧化鎢粒子及摻銣氧化鎢粒子等。 就進一步提高中間膜及層合玻璃之遮熱性之觀點而言，尤佳為摻銫氧化鎢粒子。就更進一步提高中間膜及層合玻璃之遮熱性之觀點而言，該摻銫氧化鎢粒子較佳為式：Cs0.33 WO3 所表示之氧化鎢粒子。 上述遮熱粒子之平均粒徑較佳為0.01 μm以上，更佳為0.02 μm以上，且較佳為0.1 μm以下，更佳為0.05 μm以下。若平均粒徑為上述下限以上，則熱線之遮蔽性充分地變高。若平均粒徑為上述上限以下，則遮熱粒子之分散性變高。 上述「平均粒徑」係表示體積平均粒徑。平均粒徑可使用粒度分佈測定裝置(日機裝公司製造之「UPA-EX150」)等進行測定。 上述中間膜100重量%中或包含上述遮熱粒子之層(第1層、第2層或第3層)100重量%中，上述遮熱粒子之各含量(尤其是氧化鎢粒子之含量)較佳為0.01重量%以上，更佳為0.1重量%以上，進而較佳為1重量%以上，尤佳為1.5重量%以上。上述中間膜100重量%中或包含上述遮熱粒子之層(第1層、第2層或第3層)100重量%中，上述遮熱粒子之各含量(尤其是氧化鎢粒子之含量)較佳為6重量%以下，更佳為5.5重量%以下，進而較佳為4重量%以下，尤佳為3.5重量%以下，最佳為3重量%以下。若上述遮熱粒子之含量為上述下限以上及上述上限以下，則遮熱性充分地變高，且可見光透過率充分地變高。 (金屬鹽) 上述中間膜較佳為含有鹼金屬鹽、鹼土金屬鹽及鎂鹽中之至少1種金屬鹽(以下，有時記載為金屬鹽M)。上述第1層較佳為含有上述金屬鹽M。上述第2層較佳為含有上述金屬鹽M。上述第3層較佳為含有上述金屬鹽M。藉由使用上述金屬鹽M，而變得容易控制中間膜與玻璃板等層合玻璃構件之接著性或中間膜中之各層間之接著性。上述金屬鹽M可僅使用1種，亦可將2種以上併用。 上述金屬鹽M較佳為含有選自由Li、Na、K、Rb、Cs、Mg、Ca、Sr及Ba所組成之群中之至少1種金屬。中間膜中所含之金屬鹽較佳為含有K及Mg中之至少1種金屬。 又，上述金屬鹽M更佳為碳數2～16之有機酸之鹼金屬鹽、碳數2～16之有機酸之鹼土金屬鹽或碳數2～16之有機酸之鎂鹽，進而較佳為碳數2～16之羧酸鎂鹽或碳數2～16之羧酸鉀鹽。 作為上述碳數2～16之羧酸鎂鹽及上述碳數2～16之羧酸鉀鹽，可列舉：乙酸鎂、乙酸鉀、丙酸鎂、丙酸鉀、2-乙基丁酸鎂、2-乙基丁酸鉀、2-乙基己酸鎂及2-乙基己酸鉀等。 包含上述金屬鹽M之中間膜、或包含上述金屬鹽M之層(第1層、第2層或第3層)中之Mg及K的含量之合計較佳為5 ppm以上，更佳為10 ppm以上，進而較佳為20 ppm以上，且較佳為300 ppm以下，更佳為250 ppm以下，進而較佳為200 ppm以下。若Mg及K之含量之合計為上述下限以上及上述上限以下，則可進一步良好地控制中間膜與玻璃板之接著性或中間膜中之各層間之接著性。 (紫外線遮蔽劑) 上述中間膜較佳為含有紫外線遮蔽劑。上述第1層較佳為含有紫外線遮蔽劑。上述第2層較佳為含有紫外線遮蔽劑。上述第3層較佳為含有紫外線遮蔽劑。藉由使用紫外線遮蔽劑，即便長期使用中間膜及層合玻璃，可見光透過率亦難以進一步降低。上述紫外線遮蔽劑可僅使用1種，亦可將2種以上併用。 於上述紫外線遮蔽劑中包含紫外線吸收劑。上述紫外線遮蔽劑較佳為紫外線吸收劑。 作為上述紫外線遮蔽劑，例如可列舉：包含金屬原子之紫外線遮蔽劑、包含金屬氧化物之紫外線遮蔽劑、具有苯并三唑結構之紫外線遮蔽劑(苯并三唑化合物)、具有二苯甲酮結構之紫外線遮蔽劑(二苯甲酮化合物)、具有三𠯤結構之紫外線遮蔽劑(三𠯤化合物)、具有丙二酸酯結構之紫外線遮蔽劑(丙二酸酯化合物)、具有草醯苯胺結構之紫外線遮蔽劑(草醯苯胺化合物)及具有苯甲酸酯結構之紫外線遮蔽劑(苯甲酸酯化合物)等。 作為上述包含金屬原子之紫外線遮蔽劑，例如可列舉：鉑粒子、鉑粒子之表面經二氧化矽被覆之粒子、鈀粒子及鈀粒子之表面經二氧化矽被覆之粒子等。紫外線遮蔽劑較佳為並非遮熱粒子。 上述紫外線遮蔽劑較佳為具有苯并三唑結構之紫外線遮蔽劑、具有二苯甲酮結構之紫外線遮蔽劑、具有三𠯤結構之紫外線遮蔽劑或具有苯甲酸酯結構之紫外線遮蔽劑。上述紫外線遮蔽劑更佳為具有苯并三唑結構之紫外線遮蔽劑或具有二苯甲酮結構之紫外線遮蔽劑，進而較佳為具有苯并三唑結構之紫外線遮蔽劑。 作為上述包含金屬氧化物之紫外線遮蔽劑，例如可列舉：氧化鋅、氧化鈦及氧化鈰等。進而，關於上述包含金屬氧化物之紫外線遮蔽劑，亦可表面被覆。作為上述包含金屬氧化物之紫外線遮蔽劑之表面之被覆材料，可列舉：絕緣性金屬氧化物、水解性有機矽化合物及矽酮化合物等。 作為上述絕緣性金屬氧化物，可列舉：二氧化矽、氧化鋁及氧化鋯等。上述絕緣性金屬氧化物例如具有5.0 eV以上之帶隙能。 作為上述具有苯并三唑結構之紫外線遮蔽劑，例如可列舉：2-(2'-羥基-5'-甲基苯基)苯并三唑(BASF公司製造之「Tinuvin P」)、2-(2'-羥基-3',5'-二第三丁基苯基)苯并三唑(BASF公司製造之「Tinuvin 320」)、2-(2'-羥基-3'-第三丁基-5-甲基苯基)-5-氯苯并三唑(BASF公司製造之「Tinuvin 326」)、及2-(2'-羥基-3',5'-二-戊基苯基)苯并三唑(BASF公司製造之「Tinuvin 328」)等。就遮蔽紫外線之性能優異之方面而言，上述紫外線遮蔽劑較佳為含有鹵素原子之具有苯并三唑結構之紫外線遮蔽劑，更佳為含有氯原子之具有苯并三唑結構之紫外線遮蔽劑。 作為上述具有二苯甲酮結構之紫外線遮蔽劑，例如可列舉：辛苯酮(BASF公司製造之「Chimassorb81」)等。 作為上述具有三𠯤結構之紫外線遮蔽劑，例如可列舉：ADEKA公司製造之「LA-F70」及2-(4,6-二苯基-1,3,5-三𠯤-2-基)-5-[(己基)氧基]-苯酚(BASF公司製造之「Tinuvin 1577FF」)等。 作為上述具有丙二酸酯結構之紫外線遮蔽劑，可列舉：2-(對甲氧基亞苄基)丙二酸二甲酯、2,2-(1,4-伸苯基二亞甲基)雙丙二酸四乙酯、2-(對甲氧基亞苄基)-雙(1,2,2,6,6-五甲基4-哌啶基)丙二酸酯等。 作為上述具有丙二酸酯結構之紫外線遮蔽劑之市售品，可列舉：Hostavin B-CAP、Hostavin PR-25、Hostavin PR-31(均為Clariant公司製造)。 作為上述具有草醯苯胺結構之紫外線遮蔽劑，可列舉：N-(2-乙基苯基)-N'-(2-乙氧基-5-第三丁基苯基)草酸二醯胺、N-(2-乙基苯基)-N'-(2-乙氧基-苯基)草酸二醯胺、2-乙基-2'-乙氧基-氧基醯替苯胺(Clariant公司製造之「SanduvorVSU」)等具有於氮原子上經取代之芳基等之草酸二醯胺類。 作為上述具有苯甲酸酯結構之紫外線遮蔽劑，例如可列舉：2,4-二第三丁基苯基-3,5-二第三丁基-4-羥基苯甲酸酯(BASF公司製造「Tinuvin 120」)等。 上述中間膜100重量%中或包含上述紫外線遮蔽劑之層(第1層、第2層或第3層)100重量%中，上述紫外線遮蔽劑之含量及苯并三唑化合物之含量較佳為0.1重量%以上，更佳為0.2重量%以上，進而較佳為0.3重量%以上，尤佳為0.5重量%以上。上述中間膜100重量%中或包含上述紫外線遮蔽劑之層(第1層、第2層或第3層)100重量%中，上述紫外線遮蔽劑之含量及苯并三唑化合物之含量較佳為2.5重量%以下，更佳為2重量%以下，進而較佳為1重量%以下，尤佳為0.8重量%以下。若上述紫外線遮蔽劑之含量為上述下限以上及上述上限以下，則可進一步抑制期間經過後之可見光透過率之降低。尤其是於包含上述紫外線遮蔽劑之層100重量%中，上述紫外線遮蔽劑之含量為0.2重量%以上，藉此可顯著地抑制中間膜及層合玻璃之期間經過後之可見光透過率之降低。 (抗氧化劑) 上述中間膜較佳為含有抗氧化劑。上述第1層較佳為含有抗氧化劑。上述第2層較佳為含有抗氧化劑。上述第3層較佳為含有抗氧化劑。上述抗氧化劑可僅使用1種，亦可將2種以上併用。 作為上述抗氧化劑，可列舉：苯酚系抗氧化劑、硫系抗氧化劑及磷系抗氧化劑等。上述苯酚系抗氧化劑係具有苯酚骨架之抗氧化劑。上述硫系抗氧化劑係含有硫原子之抗氧化劑。上述磷系抗氧化劑係含有磷原子之抗氧化劑。 上述抗氧化劑較佳為苯酚系抗氧化劑或磷系抗氧化劑。 作為上述苯酚系抗氧化劑，可列舉：2,6-二第三丁基對甲酚(BHT)、丁基羥基苯甲醚(BHA)、2,6-二第三丁基-4-乙基苯酚、β-(3,5-二第三丁基-4-羥基苯基)丙酸硬脂酯、2,2'-亞甲基-(4-甲基-6-丁基苯酚)、2,2'-亞甲基-(4-乙基-6-第三丁基苯酚)、4,4'-亞丁基-雙-(3-甲基-6-第三丁基苯酚)、1,1,3-三-(2-甲基-羥基-5-第三丁基苯基)丁烷、四[亞甲基-3-(3',5'-丁基-4-羥基苯基)丙酸酯]甲烷、1,3,3-三-(2-甲基-4-羥基-5-第三丁基苯酚)丁烷、1,3,5-三甲基-2,4,6-三(3,5-二第三丁基-4-羥基苄基)苯、雙(3,3'-第三丁基苯酚)酪酸二醇酯及雙(3-第三丁基-4-羥基-5-甲基苯丙酸)伸乙基雙(氧乙烯)等。可較佳地使用該等抗氧化劑中之1種或2種以上。 作為上述磷系抗氧化劑，可列舉：亞磷酸十三烷基酯、亞磷酸三(十三烷基)酯、亞磷酸三苯基酯、亞磷酸三壬基苯基酯、雙(十三烷基)季戊四醇二亞磷酸酯、雙(癸基)季戊四醇二亞磷酸酯、三(2,4-二第三丁基苯基)亞磷酸酯、亞磷酸雙(2,4-二第三丁基-6-甲基苯基)乙基酯、及2,2'-亞甲基(4,6-二第三丁基-1-苯氧基)(2-乙基己氧基)磷等。可較佳地使用該等抗氧化劑中之1種或2種以上。 作為上述抗氧化劑之市售品，例如可列舉：BASF公司製造之「IRGANOX 245」、BASF公司製造之「IRGAFOS 168」、BASF公司製造之「IRGAFOS 38」、住友化學工業公司製造之「Sumilizer BHT」、以及BASF公司製造之「IRGANOX 1010」等。 為了持續長期維持中間膜及層合玻璃之較高可見光透過率，上述中間膜100重量%中或包含抗氧化劑之層(第1層、第2層或第3層)100重量%中，上述抗氧化劑之含量較佳為0.1重量%以上。又，由於抗氧化劑之添加效果飽和，故而上述中間膜100重量%中或包含上述抗氧化劑之層100重量%中，上述抗氧化劑之含量較佳為2重量%以下。 (其他成分) 上述中間膜、上述第1層、上述第2層及上述第3層亦可視需要，分別含有偶合劑、分散劑、界面活性劑、阻燃劑、抗靜電劑、顏料、染料、金屬鹽以外之接著力調整劑、耐濕劑、螢光增白劑及紅外線吸收劑等添加劑。該等添加劑可僅使用1種，亦可將2種以上併用。 (層合玻璃) 圖3係表示使用圖1所示之層合玻璃用中間膜之層合玻璃之一例的剖視圖。 圖3所示之層合玻璃21包括：中間膜部11X、第1層合玻璃構件22、及第2層合玻璃構件23。中間膜部11X係配置並挾入至第1層合玻璃構件22與第2層合玻璃構件23之間。於中間膜部11X之第1表面配置有第1層合玻璃構件22。於中間膜部11X之與第1表面相反之第2表面配置有第2層合玻璃構件23。中間膜部11A係由圖1所示之中間膜11所形成。中間膜部11A包括：源自第1層1之第1層1X、源自第2層之第2層2X、及源自第3層之第3層3X。第1層1X係由第1層1所形成。第2層2X係由第2層2所形成。第3層3X係由第3層3所形成。 作為上述層合玻璃構件，可列舉：玻璃板及PET(聚對苯二甲酸乙二酯)膜等。關於上述層合玻璃，不僅為於2片玻璃板之間挾入有中間膜之層合玻璃，亦包含於玻璃板與PET膜等之間挾入有中間膜之層合玻璃。層合玻璃係包括玻璃板之積層體，較佳為使用至少1片玻璃板。較佳為上述第1層合玻璃構件及上述第2層合玻璃構件分別為玻璃板或PET(聚對苯二甲酸乙二酯)膜，且上述中間膜包含至少1片玻璃板作為上述第1層合玻璃構件及上述第2層合玻璃構件。尤佳為上述第1層合玻璃構件及第2層合玻璃構件兩者為玻璃板。 作為上述玻璃板，可列舉：無機玻璃及有機玻璃。作為上述無機玻璃，可列舉：浮法平板玻璃、熱線吸收板玻璃、熱線反射板玻璃、磨板玻璃、模板玻璃、嵌線板玻璃及坯玻璃等。上述有機玻璃係代替無機玻璃之合成樹脂玻璃。作為上述有機玻璃，可列舉：聚碳酸酯板及聚(甲基)丙烯酸樹脂板等。作為上述聚(甲基)丙烯酸樹脂板，可列舉：聚(甲基)丙烯酸甲酯板等。 上述第1層合玻璃構件及上述第2層合玻璃構件之各厚度並無特別限定，較佳為1 mm以上，且較佳為5 mm以下。於上述層合玻璃構件為玻璃板之情形時，該玻璃板之厚度較佳為1 mm以上，且較佳為5 mm以下。於上述層合玻璃構件為PET膜之情形時，該PET膜之厚度較佳為0.03 mm以上，且較佳為0.5 mm以下。 上述層合玻璃之製造方法並無特別限定。首先，於上述第1、第2層合玻璃構件之間挾入上述中間膜而獲得積層體。繼而，例如使所獲得之積層體通過按壓輥或放入橡膠袋中進行減壓抽吸，藉此將殘留於第1層合玻璃構件與中間膜及第2層合玻璃構件與中間膜之間的空氣進行脫氣。其後，於約70～110℃下進行預接著而獲得經預壓接之積層體。繼而，將經預壓接之積層體放入至高壓釜中，或進行加壓，而於約120～150℃及1～1.5 MPa之壓力下進行壓接。如此，可獲得層合玻璃。 上述層合玻璃可用於汽車、軌道車輛、航空器、船舶及建築物等。上述層合玻璃較佳為建築用或車輛用之層合玻璃，更佳為車輛用之層合玻璃。上述層合玻璃亦可用於該等用途以外。上述層合玻璃可用於汽車之擋風玻璃、側玻璃、後玻璃或天窗玻璃等。上述層合玻璃由於遮熱性較高且可見光透過率較高，故而可較佳地用於汽車。 上述層合玻璃係作為抬頭顯示器(HUD)之層合玻璃。於上述層合玻璃中，可將自控制單元發送之速度等測量資訊等自儀錶板之顯示單元映至擋風玻璃。因此，汽車之駕駛者不會降低視野，而可同時視認前方之視野與測量資訊。 於以下揭示實施例及比較例而進一步詳細地說明本發明。本發明不僅限定於該等實施例。 關於所使用之聚乙烯縮醛樹脂，於縮醛化時使用碳數4之正丁醛。關於聚乙烯縮醛樹脂，縮醛化度(丁醛化度)、乙醯化度及羥基之含有率係藉由依據JIS K6728「聚乙烯縮丁醛試驗方法」之方法而測得。再者，於藉由ASTM D1396-92而測定之情形時，亦顯示出與依據JIS K6728「聚乙烯縮丁醛試驗方法」之方法同樣之數值。 (實施例1) 用以形成第1層之組合物之製作： 調配以下之調配成分，利用混合輥充分地混練，而獲得用以形成第1層之組合物。對聚乙烯縮醛樹脂添加其他成分。 聚乙烯縮醛樹脂(羥基之含有率22莫耳%、乙醯化度13莫耳%、縮醛化度65莫耳%)100重量份 三乙二醇二(2-乙基己酸酯)(3GO)60重量份 Tinuvin 326(2-(2'-羥基-3'-第三丁基-5-甲基苯基)-5-氯苯并三唑、BASF公司製造之「Tinuvin 326」)0.2重量份 BHT(2,6-二第三丁基對甲酚)0.2重量份 用以形成第2層及第3層之組合物之製作： 調配以下之調配成分，利用混合輥充分地混練，而獲得用以形成第2層及第3層之組合物。對聚乙烯縮醛樹脂添加其他成分。 聚乙烯縮醛樹脂(羥基之含有率30.5莫耳%、乙醯化度1莫耳%、縮醛化度68.5莫耳%)100重量份 三乙二醇二(2-乙基己酸酯)(3GO)38重量份 Tinuvin 326(2-(2'-羥基-3'-第三丁基-5-甲基苯基)-5-氯苯并三唑、BASF公司製造之「Tinuvin 326」)0.2重量份 BHT(2,6-二第三丁基對甲酚)0.2重量份 壓接前之中間膜之製作： 使用共擠壓機，將用以形成第1層之組合物、與用以形成第2層及第3層之組合物共擠壓。於實施例1中，擠壓成形中間膜後，將中間膜加熱至100℃～150℃，保持5分鐘以內之保持時間，恢復至常溫。製作具有第2層/第1層/第3層之積層構造之楔狀中間膜。再者，下述之實施例2～12及比較例1～7中所獲得之中間膜係於一端具有最小厚度，於另一端具有最大厚度。 含有正式壓接後之中間膜之部分楔角測定用之積層體之製作： 準備具有與所獲得之壓接前之中間膜相同之大小且具有2 mm之厚度的第1玻璃板。準備具有與所獲得之壓接前之中間膜相同之大小且具有2 mm之厚度的第2玻璃板。作為第1玻璃板及第2玻璃板，使用依據JIS 3202-2011而獲得之浮法平板玻璃。(第1步驟)將上述壓接前之中間膜自一表面側載置至上述第1玻璃板上。繼而，(第2步驟)於上述壓接前之中間膜上使上述第2玻璃板之一端與上述壓接前之中間膜之一端對齊且使上述第2玻璃板之面方向與上述第1玻璃板面方向成直角方向，而載置至上述壓接前之中間膜之另一表面上。繼而，(第3步驟)一邊固定上述第2玻璃板之上述一端一邊將上述第2玻璃板傾倒，使上述第2玻璃板之表面與上述壓接前之中間膜之上述另一表面接觸，且將上述第2玻璃設為上述第2玻璃之重量於上述壓接前之中間膜之上述另一表面上達到均衡之狀態。其後，(第4步驟)藉由240℃及98 N/cm之線壓力之輥壓進行預壓接。繼而，(第5步驟)於140℃及1.3 MPa之壓力下進行正式壓接，而獲得正式壓接後之中間膜。所獲得之正式壓接後之中間膜係將正式壓接後之中間膜配置在上述第1玻璃板與上述第2玻璃板之間的積層體之狀態。 (實施例2～9、11及比較例1～4、6) 壓接前之中間膜之製作： 如下述之表1、2所示設定下述項目，除此以外，以與實施例1相同之方式獲得中間膜。 用以形成第1層之組合物與用以形成第2層及第3層之組合物中之塑化劑相對於聚乙烯縮醛樹脂100重量份之調配量 中間膜中之最小厚度、最大厚度、上述部分楔角之變化率之平均、上述部分楔角之變化率之最大值 上述第3步驟之後且上述第4步驟之前之接觸部位數 又，於實施例2～9、11及比較例1～4、6中，將與實施例1相同種類之紫外線遮蔽劑及抗氧化劑以與實施例1相同之調配量(相對於聚乙烯縮醛樹脂100重量份為0.2重量份)進行調配。再者，實施例及比較例係分別使用不同形狀之模具而擠壓成形中間膜。 含有正式壓接後之中間膜之部分楔角測定用之積層體之製作： 使用所獲得之壓接前之中間膜，以與實施例1相同之方式製作含有正式壓接後之中間膜之積層體。 (實施例10) 用以形成單層中間膜之組合物之製作： 調配以下之調配成分，利用混合輥充分地混練，而獲得用以形成單層中間膜之組合物。對聚乙烯縮醛樹脂添加其他成分。 聚乙烯縮醛樹脂(羥基之含有率30.5莫耳%、乙醯化度1莫耳%、縮醛化度68.5莫耳%)100重量份 三乙二醇二(2-乙基己酸酯)(3GO)40重量份 Tinuvin 326(2-(2'-羥基-3'-第三丁基-5-甲基苯基)-5-氯苯并三唑、BASF公司製造之「Tinuvin 326」)0.2重量份 BHT(2,6-二第三丁基對甲酚)0.2重量份 單層中間膜之製作： 使用擠壓機，將用以形成單層中間膜之組合物進行擠壓。擠壓成形中間膜後，將中間膜加熱至100℃～150℃，保持5分鐘以內之保持時間，恢復至常溫。 含有正式壓接後之中間膜之部分楔角測定用之積層體之製作： 使用所獲得之中間膜，以與實施例1相同之方式製作含有正式壓接後之中間膜之部分楔角測定用的積層體。 (實施例12及比較例5、7) 壓接前之中間膜之製作： 如下述之表3所示設定以下項目，除此以外，以與實施例10相同之方式獲得中間膜。 中間膜中之塑化劑相對於聚乙烯縮醛樹脂100重量份之調配量 中間膜中之最小厚度、最大厚度、上述部分楔角之變化率之平均、上述部分楔角之變化率之最大值 上述第3步驟之後且上述第4步驟之前之接觸部位數 又，於實施例12及比較例5、7中，將與實施例10相同種類之紫外線遮蔽劑及抗氧化劑以與實施例10相同之調配量(相對於聚乙烯縮醛樹脂100重量份為0.2重量份)進行調配。再者，實施例及比較例係分別使用不同形狀之模具而擠壓成形中間膜。 (評價) (1)彈性模數 以下述方式測定實施例1～9、11及比較例1～4、6之壓接前之中間膜中之第2、3之層、以及實施例10、12及比較例5、7之壓接前之中間膜於23℃下的彈性模數。 彈性模數之測定方法： 準備用以形成供測定之層或中間膜之組合物之混練物。利用加壓成形機將所獲得之混練物於150℃下進行加壓成形，而獲得厚度為0.35 mm之樹脂膜。將所獲得之樹脂膜於25℃及相對濕度30%之條件下放置2小時。放置2小時後，使用TA Instruments公司製造之「ARES-G2」而測定黏彈性。作為治具，使用直徑8 mm之平行板。於以3℃/分鐘之降溫速度使溫度自30℃降低至-50℃之條件、及頻率1 Hz及應變1%之條件下進行測定。 再者，彈性模數之測定亦可以下述方式進行。將所獲得之中間膜於室溫23±2℃、相對濕度25±5%之環境下保管1個月後，於室溫23℃±2℃之環境下，自中間膜剝離第2層及第3層，藉此獲得第2層及第3層。亦可將所獲得之第2層及第3層以厚度成為0.35 mm之方式於150℃下進行加壓成形(於未加壓之狀態下於150℃下10分鐘，於加壓之狀態下於150℃下10分鐘)而製作樹脂膜。 (2)部分楔角之變化率 壓接前之中間膜之部分楔角之測定：使用山文電氣公司製造之「TOF-4R」，利用上述之方法測定部分楔角。 正式壓接後之中間膜之部分楔角之測定：使用Metrics公司製造之「OPTIGAUGE」，利用上述之方法測定部分楔角。 於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至上述一端與上述另一端間之中央位置為止的上述第1區域中每隔10 mm之各地點測定各部分楔角。又，於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至自上述另一端起朝向上述一端40 mm之位置的上述第2區域中每隔10 mm之各地點測定各部分楔角。 於上述第1區域內之測定中，根據上述式(X)而求出各地點之部分楔角之變化率。於上述第1區域內之測定中，根據上述式(Y)而求出部分楔角之變化率之平均值。 於上述第2區域內之測定中，根據上述式(X)而求出各地點之部分楔角之變化率。於上述第2區域內之測定中，將部分楔角之變化率之值中之最大值設為部分楔角之變化率之最大值。 (3)雙重影像 將所獲得之積層體設置至擋風玻璃之位置。使顯示資訊自設置在積層體之下方之顯示單元反射至層合玻璃，於特定位置(顯示對應區域之整體)利用目視確認有無雙重影像。以下述基準判定雙重影像。 [雙重影像之判定基準] ○○：未確認到雙重影像 ○：雖確認到極少之雙重影像，但為實際使用上無影響之等級 ×：不符合○○及○之判定基準 將詳細內容及結果示於下述之表1～3。 [表1]
Figure 107108829-A0304-0001
 [表2]
Figure 107108829-A0304-0002
 [表3]
Figure 107108829-A0304-0003
 再者，關於使用實施例1～9、11中所獲得之中間膜之層合玻璃，根據聲透射損失而評價遮音性，結果確認到遮音性優異。Hereinafter, the details of the present invention will be described. The interlayer film for laminated glass of the present invention (sometimes referred to as "interlayer film" in this specification) is used for laminated glass. The interlayer film of the present invention has a one-layer structure or a two-layer or more structure. The interlayer film of the present invention may have a one-layer structure, or may have a two-layer structure or more. The interlayer film of the present invention may have a two-layer structure, may have a two-layer structure or more, may have a three-layer structure, or may have a three-layer structure or more. The intermediate film of the present invention may be a single-layer intermediate film or a multilayer intermediate film. The intermediate film of the present invention has one end and the other end located on the opposite side of the one end. The one end and the other end are connected to the opposite ends of the intermediate film. In the intermediate film of the present invention, the thickness of the other end is greater than the thickness of the one end. In the intermediate film of the present invention, the thickness of the intermediate film from the one end to the other end increases unevenly. The intermediate film of the present invention has convex portions on the surface or concave portions on the surface. Prepare a first glass plate with the same size and thickness of 2 mm as the interlayer film of the present invention. The first glass plate is float plate glass obtained in accordance with JIS 3202-2011. Prepare a second glass plate with the same size and thickness of 2 mm as the interlayer film of the present invention. The second glass plate is float plate glass obtained in accordance with JIS 3202-2011. Using the intermediate film of the present invention as the intermediate film before crimping, the following first, second, third, fourth, and fifth steps are used in order to obtain the intermediate film after formal crimping. Step 1: Place the interlayer film before crimping on the first glass plate from one surface side. The first glass plate has the same size as the intermediate film before crimping and has a thickness of 2 mm. The first glass plate is float plate glass obtained in accordance with JIS 3202-2011. Step 2: Load the second glass plate so that one end of the second glass plate is aligned with one end of the intermediate film and the surface direction of the second glass plate is at right angles to the surface direction of the first glass plate Place it on the other surface of the intermediate film. The second glass plate has the same size as the intermediate film before crimping and has a thickness of 2 mm. The second glass plate is float plate glass obtained in accordance with JIS 3202-2011. Step 3: Tilt the second glass plate while fixing the one end of the second glass plate, make the surface of the second glass plate contact the other surface of the intermediate film, and set the second glass as The weight of the second glass is balanced on the other surface of the intermediate film. Step 4: Perform pre-compression bonding by roller pressure at 240°C and 98 N/cm linear pressure. Step 5: Perform formal crimping at 140°C and a pressure of 1.3 MPa to obtain an intermediate film after formal crimping. The obtained interlayer film after the main pressure bonding is in a state where the interlayer film after the main pressure bonding is arranged in a laminate between the first glass plate and the second glass plate. For each of the intermediate film before crimping and the intermediate film after the formal crimping, the position of the intermediate film is 40 mm from the one end toward the other end to the center position between the one end and the other end When measuring the wedge angle of each part in the first area (the first measurement area) every 10 mm, the average value of the change rate of the part wedge angle calculated by the following formula (X) is 10% or less . Change rate of partial wedge angle (%)=|(Partial wedge angle of the interlayer after formal crimping－Partial wedge angle of the interlayer before crimping)/(Partial wedge angle of the interlayer before crimping)|× 100 Formula (X) In the present invention, due to the above-mentioned structure, the change in the wedge angle can be suppressed when the laminated glass using the interlayer film of the present invention is produced, and the laminated glass using the interlayer film of the present invention can be suppressed The double image. The average value of the rate of change of the partial wedge angle is obtained by calculating the rate of change of the partial wedge angle at every 10 mm point (1st to nth point (n is an integer of 2 or more)) in the first area mentioned above. , Averaging the rate of change of this part of the wedge angle to obtain. From the viewpoint of further effectively suppressing the change of partial wedge angles during the production of laminated glass, and further effectively suppressing the double image in the laminated glass, in the above-mentioned first area, each partial wedge angle of every 10 mm In the measurement, the average value of the rate of change of the partial wedge angle calculated from the above formula (X) is preferably 5% or less. When the partial wedge angle is measured from the first point to the nth point (n is an integer of 2 or more), and the change rate of n partial wedge angles is obtained, the average value of the change rate of the above partial wedge angle means The average value of the rate of change of n partial wedge angles. In the interlayer film of the present invention, from a position of 40 mm from the one end to the other end to a position of 40 mm from the other end to the one end, every 10 mm Measure the wedge angle of each part at each location. In this measurement, the maximum value of the rate of change of the partial wedge angle calculated according to the above formula (X) is preferably 15% or less, more preferably 10% or less, and still more preferably 5% or less. If the above-mentioned maximum value is above the above-mentioned lower limit and below the above-mentioned upper limit, the change of part of the wedge angle can be further effectively suppressed when the laminated glass is produced, and the double image in the laminated glass can be further effectively suppressed. When the partial wedge angle is measured from the first point to the nth point (n is an integer of 2 or more) and the rate of change of n partial wedge angles is obtained, the maximum value of the rate of change of the partial wedge angle means n The maximum value of the rate of change of the wedge angle of each part. Specifically, the rate of change of the partial wedge angles at the first to nth points is calculated according to the following formulas (X1) to (Xn), respectively. The rate of change of the partial wedge angle at the first location (%)=|(the partial wedge angle of the intermediate membrane at the first location after the formal crimping-the partial wedge angle of the intermediate membrane at the first location before the crimping)/( The partial wedge angle of the interlayer film at the first place before crimping)｜×100 formula (X1) The change rate of the partial wedge angle at the second place (%)=｜(the interlayer film after the formal crimping at the second place The partial wedge angle-the partial wedge angle of the interlayer before crimping at the second location)/(the partial wedge angle of the interlayer before crimping at the second location)｜×100 formula (X2) (formula (X3)～ The formula (Xn-1) is omitted) The rate of change of the partial wedge angle at the nth position (%)=|(The partial wedge angle of the interlayer film at the nth position after the formal crimping-the interlayer film before crimping at the nth position Partial wedge angle at n location)/(Partial wedge angle at n-th location of the interlayer film before crimping)|×100 Formula (Xn) When the measurement is performed in the above-mentioned first area, the first point is the above-mentioned first 1 Among the points every 10 mm in the area, the point closest to the above-mentioned one end. When the measurement is performed in the above-mentioned first area, the n-th point is the point closest to the other end side among the points every 10 mm in the above-mentioned first area. When the measurement is performed in the second area described above, the first point is the point closest to the one end side among the points every 10 mm in the second area. When the measurement is performed in the above second area, the nth point is the point closest to the other end side among the points every 10 mm in the second area. The first point is a point 40 mm away from the intermediate film from the one end and toward the other end. The second point is a point 50 mm away from the intermediate film from the one end and toward the other end. The n-th point is a point (40+10×(n-1)) mm away from the one end of the intermediate film and toward the other end. n is equivalent to the total number of points where a part of the wedge angle can be measured in the respective measurements in the first area and the second area. When the measurement is performed in the first area as described above, the nth point is the point closest to the other end side among the points every 10 mm in the first area. In the case of performing measurement in the above-mentioned first area, when the nth point is selected from the first point at 10 mm intervals in sequence (the second point, the third point, ...), it shall not exceed the other The center position between the one end and the other end of the intermediate film is selected within the range of one end side. When the measurement is performed in the first region, the n-th point may also coincide with the center position between the one end and the other end of the intermediate film, and the n-th point may also be greater than the one between the one end and the other end of the intermediate film. The center position between the other ends is close to the above one end side. When the measurement is performed in the first region, the n-th point is not closer to the other end than the center position between the one end and the other end of the intermediate film. When the measurement is performed in the second area as described above, the nth point is the point closest to the other end side among the points every 10 mm in the second area. In the case of measuring in the second area mentioned above, when the nth point is selected from the first point in order at 10 mm intervals (the second point, the third point, ...), it shall not exceed the other In the range of one end side, select the position of the intermediate film 40 mm from the other end toward the one end. When the measurement is performed in the second region, the n-th point may be the same as the center position between the one end and the other end of the intermediate film, and the n-th point may also be from the other end of the intermediate film. A position 40 mm from the above one end is close to the above one end side. When the measurement is performed in the second region, the n-th point is not closer to the other end than the position of the intermediate film 40 mm from the other end to the one end. When measuring the partial wedge angle from the first point to the nth point (n is an integer of 2 or more), the average value of the rate of change of the partial wedge angle is calculated according to the following formula (Y). Average rate of change of partial wedge angle (%) = (change rate of partial wedge angle at the first location + change rate of partial wedge angle at the second location +...+ of the partial wedge angle at the nth location Rate of change)/n Formula (Y) In the above formula (Y), n is an integer of 2 or more. In addition, n is the total number of locations where a part of the wedge angle can be measured. Then, for each of the interlayer film before crimping and the interlayer film after formal crimping, the specific method of measuring the partial wedge angle at each point at intervals of 10 mm will be explained. The specific method of determining the partial wedge angle at every 10 mm points of the interlayer film before crimping: The method of calculating the partial wedge angle at every 10 mm points of the interlayer film before crimping is as follows . As the measuring machine used to measure the wedge angle of the interlayer film every 10 mm before crimping, the contact thickness measuring device "TOF-4R" (manufactured by Sanbun Electric Co., Ltd.) can be cited. The method of obtaining the partial wedge angle at the first location is as follows. The thickness of the intermediate film before crimping is measured at 41 points at intervals of 2 mm from the one end to a position 80 mm away from the one end and toward the other end. Set the distance from one end (set to the position of x=0 mm) to the other end to the thickness measurement location (unit mm) as the x-axis, and set the thickness of the interlayer film (unit: μm) before crimping as y Axis, a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at the first point. The method of obtaining the partial wedge angle at the second location is as follows. The thickness of the intermediate film before the above-mentioned crimping was measured at 41 points at intervals of 2 mm from a position 10 mm from the one end toward the other end to a position 90 mm away from the one end and toward the other end. Set the distance (in mm) from the position 20 mm from one end to the position of the thickness measurement point (in mm) from one end to the other end to the position where the thickness is measured as the x-axis, and set the thickness of the interlayer film before crimping (in units) μm) is set as the y-axis, and a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at the second point. (The method for obtaining the partial wedge angle from the 3rd point to the n-1th point is omitted) The method for obtaining the partial wedge angle from the nth point is as follows. The distance between the intermediate film before the crimping is from the one end and toward the other end (20-10×(n-1)) mm to the distance from the one end and toward the other end (100-10×(n-1)) At the position of mm, the thickness is measured at 41 points at intervals of 2 mm. Set the distance (in mm) from one end (20-10×(n-1)) mm position (set as x=0 mm position) to the other end to the thickness measurement point as the x-axis, and set the above The thickness (unit: μm) of the interlayer film before crimping is set as the y-axis, and a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at the nth point. In addition, the wedge angles of the respective parts from the first point to the n-th point can be collectively displayed as follows. The interlayer film before crimping is measured at 41 positions every 2 mm from the position from the one end toward the other end (10×A) mm to the position away from the one end and toward the other end (80+10×A) mm The thickness (A is an integer above 0). Set the distance (in mm) from one end (10×A) mm position (set as x=0 mm position) to the other end to the thickness measurement location as the x-axis, and set the above-mentioned intermediate film before crimping The thickness (unit: μm) is set as the y-axis, and a straight line is obtained by the least square method. The internal angle formed by the obtained first-order straight line and the straight line y=0 is set as the partial wedge angle at each point from the first to the nth. The specific method of measuring the partial wedge angles at every 10 mm points of the interlayer film after the formal crimping: At the above 10 mm points of the interlayer film after the formal crimping, the part of the wedge angle is the same as the above The measurement is performed in the same way as when measuring the wedge angle of the interlayer film every 10 mm before the formal crimping. As a measuring device used to measure the wedge angle of the interlayer film at intervals of 10 mm after the above-mentioned formal crimping, a non-contact multilayer film thickness measuring device "OPTIGAUGE" (manufactured by Metrics) can be cited. In the above-mentioned measurement of the partial wedge angle after the formal crimping, the thickness of the interlayer film after the formal crimping can be measured in the state of the laminate. The method of obtaining the partial wedge angle at the first location is as follows. The thickness of the intermediate film after the formal crimping is measured at 41 points at intervals of 2 mm from the position from the one end to the position 80 mm away from the one end and toward the other end. Set the distance (in mm) from one end (set to the position of x=0 mm) to the other end to the thickness measurement location as the x-axis, and set the thickness of the interlayer film (in μm) after the above-mentioned formal crimping as On the y axis, a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at the first point. The method of obtaining the partial wedge angle at the second location is as follows. After the above-mentioned formal crimping, the thickness of the intermediate film is measured from a position 10 mm from the one end toward the other end to a position 90 mm away from the one end and toward the other end at 41 points at intervals of 2 mm. Set the distance (in mm) from the position 20 mm from one end (set to the position of x=0 mm) to the other end to the point of thickness measurement as the x-axis, and set the thickness of the interlayer film after the above-mentioned formal crimping ( The unit (μm) is set as the y-axis, and a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at the second point. (The method for obtaining the partial wedge angle at the 3rd point to the n-1th position is omitted) The method for obtaining the partial wedge angle at the nth position is as follows. After the above-mentioned formal crimping, the intermediate film is from the position from the one end to the other end (20-10×(n-1))mm to the distance from the one end and toward the other end (100-10×(n－ 1)) At the position of mm, the thickness is measured at 41 points at intervals of 2 mm. Set the distance (in mm) from one end (20-10×(n-1)) mm position (set as x=0 mm position) to the other end to the thickness measurement point as the x-axis, and set the above The thickness (unit: μm) of the interlayer film after the formal crimping is set as the y-axis, and a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at the nth point. In addition, the wedge angles of the respective parts from the first point to the n-th point can be collectively displayed as follows. Measure every 2 mm from the position of the intermediate film after the formal crimping from the one end to the other end (10×A) mm to the position away from the one end and toward the other end (80+10×A) mm Thickness at 41 places (A is an integer greater than 0). Set the distance from one end (10×A) mm (set to x=0 mm) to the other end to the thickness measurement location (unit mm) as the x-axis, and set the middle of the above-mentioned formal crimping The thickness of the film (unit: μm) is set as the y-axis, and a straight line is obtained by the least square method. The internal angle formed by the obtained primary straight line and the y=0 straight line is set as the partial wedge angle at each point from the 1st to the nth. The above-mentioned intermediate film preferably includes a layer having an elastic modulus G'at 23°C of 4 MPa or more, more preferably includes a layer having an elastic modulus G'at 23°C of 8 MPa or more, and more preferably includes 23°C The elastic modulus G'below is a layer above 20 MPa. If the elastic modulus G'of the above-mentioned layer at 23°C is above the above-mentioned lower limit, the change of part of the wedge angle can be further effectively suppressed when the laminated glass is made, and the double image in the laminated glass can be further effectively suppressed. The above-mentioned intermediate film preferably includes a layer having an elastic modulus G'at 23°C of 4 MPa or more as a surface layer, and more preferably includes a layer having an elastic modulus G'at 23°C of 8 MPa or more as a surface layer, and further It is preferable to include a layer having an elastic modulus G'at 23° C. of 20 MPa or more as the surface layer. If the elastic modulus G'at 23°C of the above-mentioned layer as the surface layer is above the above lower limit, the change of part of the wedge angle can be further effectively suppressed when the laminated glass is produced, and the increase in the laminated glass can be further effectively suppressed. The double image. The modulus of elasticity G'at 23°C above the lower limit of the layer above the modulus of elasticity G'at 23°C may also be 55 Pa or less. From the viewpoint of further effectively suppressing changes in part of the wedge angle during the production of laminated glass, and further effectively suppressing double images in the laminated glass, the interlayer film of the present invention is preferably the following interlayer film (1) , More preferably the following intermediate film (2), and still more preferably the following intermediate film (3). The intermediate film (1) is after the third step and before the fourth step when the intermediate film after the formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. In the region from the position of the one end to the center position between the one end and the other end of the intermediate film, the intermediate film is in contact with the second glass plate at two or more spaced apart locations. The intermediate film (2) is after the third step and before the fourth step when the intermediate film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. In the region from the position of the one end to the center position between the one end and the other end of the intermediate film, the intermediate film is in contact with the second glass plate at three or more places. The intermediate film (3) is after the third step and before the fourth step when the intermediate film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. In the region from the position of the one end to the center position between the one end and the other end of the intermediate film, the intermediate film is in contact with the second glass plate at four or more places. After the interlayer film before crimping is in contact with the second glass plate at two or more separated locations, the interlayer film before crimping and the entire second glass plate may be in surface contact until the crimping is completed. When the interlayer film before crimping is in contact with the second glass plate in a plurality of separated locations, the distance (the distance between the interlayer film before crimping and the second glass plate without contact) can be It can be 1 μm or more, it can be 1 mm or more, it can be 10 mm or more, it can be 1 cm or more, or it can be 10 cm or more. In the interlayer film whose surface is embossed, the above-mentioned separation distance generally does not become 1 mm or more, especially it does not become 10 mm or more. The non-contact distance between the interlayer film before the pressure bonding and the second glass plate is the distance per part of the non-contact. Furthermore, there are cases where after the third step and before the fourth step when the intermediate film after the formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence, In the region from the position of the one end to the central position between the one end and the other end of the intermediate film before crimping, at two or more places, the intermediate film before crimping and the second The glass plate touches. In this case, the place where the interlayer film before the pressure bonding and the second glass plate first contact may be one place. As long as the interlayer film before the pressure bonding is in contact with the second glass plate at two or more separated locations before the pressure bonding is performed and the pressure bonding is completed. From the viewpoint of further effectively suppressing changes in part of the wedge angle during the production of laminated glass, and further effectively suppressing double images in the laminated glass, the interlayer film of the present invention is preferably the following interlayer film (2) . The intermediate film (2) is after the third step and before the fourth step when the intermediate film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. In the region from the position of the one end to the position of the other end of the intermediate film, the intermediate film is in a state where the intermediate film is in contact with the second glass plate at three or more separated locations. After the interlayer film before crimping is in contact with the second glass plate at three or more spaced locations, the interlayer film before crimping and the entire second glass plate may be in surface contact until the crimping is completed. From the viewpoint of further effectively suppressing changes in part of the wedge angle during the production of laminated glass, and further effectively suppressing double images in the laminated glass, the interlayer film of the present invention is preferably the following interlayer film (4) , More preferably the following intermediate film (5), and still more preferably the following intermediate film (6). The intermediate film (4) is after the third step and before the fourth step when the intermediate film after the formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. The area from the center of the intermediate film between the one end and the other end to the position of the other end of the interlayer film before crimping becomes four spaced apart between the interlayer film before crimping and the second glass plate The state of no contact above the site. The intermediate film (5) is after the third step and before the fourth step when the intermediate film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. The area from the center position between the one end and the other end to the position of the other end of the interlayer film before crimping becomes three spaced apart between the interlayer film before crimping and the second glass plate The state of no contact above the site. The intermediate film (6) is after the third step and before the fourth step when the intermediate film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence. The area from the center of the intermediate film between the one end and the other end to the position of the other end of the intermediate film before crimping becomes two spaced apart between the intermediate film before crimping and the second glass plate The state of no contact above the site. The intermediate film of the present invention may also have a shaded area. The above-mentioned shaded area may also be separated from the display corresponding area. The above-mentioned shadow area is provided for the purpose of preventing a driver who is driving from feeling dazzling due to sunlight, outdoor lighting, etc., for example. The above-mentioned shaded area may also be provided to provide heat shielding properties. The above-mentioned shaded area is preferably located at the edge of the intermediate film. The above-mentioned shaded area is preferably band-shaped. In shaded areas, colorants or fillers can also be used in order to change the color and visible light transmittance. The coloring agent or filler may be contained only in a partial area of the thickness direction of the intermediate film, or may be contained in the entire area of the thickness direction of the intermediate film. The intermediate film of the present invention has, for example, a display corresponding area corresponding to the display area of a head-up display. The above-mentioned display corresponding area is an area where information can be displayed well. From the viewpoint of making the display better and further expanding the field of view, the visible light transmittance of the display corresponding area is preferably 80% or more, more preferably 88% or more, and even more preferably 90% or more. The visible light transmittance of the display corresponding area is preferably higher than the visible light transmittance of the shadow area. The visible light transmittance of the display corresponding area may also be lower than the visible light transmittance of the shadow area. The visible light transmittance of the display corresponding area is preferably higher than the visible light transmittance of the shadow area by 50% or more, and more preferably 60% or more. Furthermore, for example, when the visible light transmittance changes in the intermediate film of the display corresponding area and the shadow area, the visible light transmittance is measured at the center position of the display corresponding area and the center of the shadow area. A spectrophotometer ("U-4100" manufactured by Hitachi High-Technologies Corporation) can be used to measure the visible light transmittance of the obtained laminated glass at a wavelength of 380-780 nm in accordance with JIS R3211 (1998). Furthermore, it is preferable to use transparent glass with a thickness of 2 mm as the glass plate. The above-mentioned display corresponding area preferably has a length direction and a width direction. Since the intermediate film is excellent in versatility, the width direction of the display corresponding area is preferably a direction connecting the one end and the other end. The above-mentioned display corresponding area is preferably band-shaped. The above-mentioned intermediate film preferably has an MD direction and a TD direction. The intermediate film is obtained by, for example, melt extrusion molding. The MD direction is the traveling direction of the intermediate film during the manufacture of the intermediate film. The TD direction is a direction orthogonal to the advancing direction of the intermediate film at the time of manufacture of the intermediate film, and is a direction orthogonal to the thickness direction of the intermediate film. The one end and the other end are preferably located on both sides of the TD direction. From the viewpoint of further improving the display, the intermediate film preferably has a wedge-shaped cross-sectional shape in the thickness direction. Preferably, the cross-sectional shape of the thickness direction showing the corresponding area is a wedge shape. Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. Figs. 1(a) and (b) schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to the first embodiment of the present invention. Fig. 1(a) is a cross-sectional view taken along line II in Fig. 1(b). Furthermore, regarding the size and dimensions of the intermediate film in FIG. 1 and the following figures, for the convenience of illustration, the actual size and shape are appropriately changed. In FIG. 1(a), the cross section of the interlayer film 11 in the thickness direction is shown. Furthermore, in Figure 1(a) and the following figures, for the convenience of illustration, the thickness and wedge angle (θ) of the interlayer film and the layers constituting the interlayer film are different from the actual thickness and wedge angle. show. The intermediate film 11 includes a first layer 1 (intermediate layer), a second layer 2 (surface layer), and a third layer 3 (surface layer). The second layer 2 is arranged on the first surface side of the first layer 1 and laminated. The third layer 3 is arranged and laminated on the second surface side of the first layer 1 opposite to the first surface. The first layer 1 is arranged and sandwiched between the second layer 2 and the third layer 3. The intermediate film 11 is used to obtain laminated glass. The interlayer film 11 is an interlayer film for laminated glass. The intermediate film 11 is a multilayer intermediate film. The intermediate film 11 has one end 11a and the other end 11b on the opposite side of the one end 11a. One end 11a and the other end 11b are opposite ends. The cross-sectional shape in the thickness direction of the second layer 2 and the third layer 3 is wedge-shaped. The cross-sectional shape of the first layer 1 in the thickness direction is rectangular. The thickness of the second layer 2 and the third layer 3 is greater on the other end 11b side than on the one end 11a side. Therefore, the thickness of the other end 11b of the intermediate film 11 is greater than the thickness of the one end 11a. Therefore, the intermediate film 11 has a thinner region and a thicker region. The intermediate film 11 has an area where the thickness increases from the one end 11a side to the other end 11b side. The intermediate film 11 is in a region where the thickness is increased, and the increase in thickness from the side of one end 11a to the side of the other end 11b is different. With respect to one surface of the intermediate film 11, the slope of the other surface of the intermediate film 11 is not necessarily in the entire intermediate film 11. The intermediate film 11 actually has recesses or protrusions on the surface, but since the recesses or protrusions are relatively small, they are not shown in FIG. 1. The intermediate film 11 has a display corresponding area R1 corresponding to the display area of the head-up display. The intermediate film 11 has a surrounding area R2 in the vicinity of the display corresponding area R1. The intermediate film 11 has a shaded area R3 separated from the display corresponding area R1. The shaded area R3 is located at the edge of the intermediate film 11. The intermediate film has the shape shown in Fig. 1(a), and may be a single layer, two layers, or four or more layers. Fig. 4 is a perspective view schematically showing a roll body formed by winding the interlayer film for laminated glass shown in Fig. 1. The intermediate film 11 may be wound to form the roll body 51 of the intermediate film 11. The roller body 51 shown in FIG. 4 includes a core 61 and an intermediate film 11. The intermediate film 11 is wound around the outer circumference of the winding core 61. Figs. 2(a) and (b) schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to a second embodiment of the present invention. Figure 2(a) is a cross-sectional view taken along line II in Figure 2(b). In FIG. 2(a), a cross section in the thickness direction of the intermediate film 11A is shown. The intermediate film 11A shown in FIG. 2 includes the first layer 1A. The intermediate film 11A has a one-layer structure with only the first layer 1A, and is a single-layer intermediate film. The intermediate film 11A is the first layer 1A. The intermediate film 11A is used to obtain laminated glass. The interlayer film 11A is an interlayer film for laminated glass. The intermediate film 11A has one end 11a and the other end 11b on the opposite side of the one end 11a. One end 11a and the other end 11b are opposite ends. The thickness of the other end 11b of the intermediate film 11A is greater than the thickness of the one end 11a. Therefore, the intermediate film 11A and the first layer 1A have a thinner region and a thicker region. The intermediate film 11A has a region where the thickness increases from the one end 11a side to the other end 11b side. The intermediate film 11A has a different increase in thickness from the one end 11a side to the other end 11b side in the area where the thickness increases. The intermediate film 11A has a different increase in thickness from the one end 11a side to the other end 11b side in the area where the thickness increases. With respect to one surface of the intermediate film 11A, the slope of the other surface of the intermediate film 11A is not necessarily constant in the entire intermediate film 11A. The intermediate film 11A actually has recesses or protrusions on the surface, but since the recesses or protrusions are relatively small, they are not shown in FIG. 2. The intermediate film 11A and the first layer 1A have rectangular sections 11Aa and 1Aa in the thickness direction, and wedge sections 11Ab and 1Ab in the thickness direction. The intermediate film 11A has a display corresponding area R1 corresponding to the display area of the head-up display. The intermediate film 11A has a surrounding area R2 around the display corresponding area R1. The intermediate film 11A has a shaded area R3 separated from the display corresponding area R1. The shaded area R3 is located at the edge of the intermediate film 11A. The intermediate film has the shape shown in Fig. 2(a), and may have two or more layers. The intermediate film preferably has a wedge-shaped cross-sectional shape in the thickness direction. The above-mentioned intermediate film preferably has a portion whose thickness gradually increases from one end to the other end. The cross-sectional shape of the interlayer film in the thickness direction is preferably a wedge shape. Examples of the cross-sectional shape of the interlayer film in the thickness direction include trapezoids, triangles, and pentagons. From the viewpoint of further suppressing double images, the intermediate film preferably has a portion where the increase in thickness from one end side to the other end side becomes larger in the area where the thickness increases. From the viewpoint of further suppressing double images, the intermediate film preferably has a portion where the wedge angle increases from one end side to the other end in a region where the cross-sectional shape in the thickness direction is wedge-shaped. In order to suppress double images, the wedge angle (θ) of the interlayer film can be appropriately set depending on the installation angle of the laminated glass. The wedge angle (θ) is the wedge angle in the entire interlayer. From the viewpoint of further suppressing double images, the wedge angle (θ) of the interlayer is preferably 0.1 mrad (0.00575 degrees) or more, more preferably 0.2 mrad (0.0115 degrees) or more. In addition, if the wedge angle θ is greater than or equal to the lower limit, a laminated glass suitable for vehicles with a large installation angle of the windshield such as rails or buses can be obtained. From the viewpoint of further suppressing double images, the wedge angle θ of the interlayer is preferably 2 mrad (0.1146 degrees) or less, more preferably 0.7 mrad (0.0401 degrees) or less. In addition, if the wedge angle θ is below the upper limit, laminated glass for vehicles with a small installation angle of the windshield such as sports cars can be obtained. The above-mentioned wedge angle (θ) of the intermediate film is a straight line connecting the maximum thickness part and the minimum thickness part of the surface part (first surface part) of the intermediate film in the intermediate film, and the maximum thickness part of the intermediate film The inner angle at the intersection of the straight line connecting with the surface part (second surface part) on the other side of the intermediate film of the smallest thickness part. Furthermore, when there are multiple parts with the maximum thickness, multiple parts with the minimum thickness, the maximum thickness part exists in a certain area, or the minimum thickness part exists in a certain area, it is used to find the maximum thickness of the wedge angle θ The part and the minimum thickness part are selected so that the wedge angle θ obtained becomes the largest. The thickness of the above-mentioned intermediate film is not particularly limited. The thickness of the above-mentioned intermediate film shows the total thickness of each layer constituting the intermediate film. Therefore, in the case of a multilayer interlayer film 11, the thickness of the interlayer film shows the total thickness of the first layer 1, the second layer 2, and the third layer 3. The maximum thickness of the intermediate film is preferably 0.1 mm or more, more preferably 0.25 mm or more, more preferably 0.5 mm or more, particularly preferably 0.8 mm or more, and preferably 3 mm or less, more preferably 2 mm or less, and further Preferably it is 1.5 mm or less. Set the distance between one end and the other end to X. The intermediate film preferably has the smallest thickness in an area that is 0X to 0.2X away from one end and toward the inner side, and has the largest thickness in an area that is 0X to 0.2X away from the other end and toward the inner side. It is more preferable that the intermediate film has the smallest thickness in an area that is 0X to 0.1X away from one end and toward the inner side, and has the largest thickness in an area that is 0X to 0.1X away from the other end and toward the inner side. The intermediate film preferably has the smallest thickness at one end, and the intermediate film preferably has the largest thickness at the other end. The intermediate films 11 and 11A have the largest thickness at the other end 11b and the smallest thickness at the one end 11a. The above-mentioned intermediate film may have a portion having a uniform thickness. The above-mentioned uniform thickness portion means that the thickness change does not exceed 10 μm for every 10 cm distance in the direction connecting the above-mentioned one end of the intermediate film and the above-mentioned other end. Therefore, the uniform thickness portion is a portion where the thickness change does not exceed 10 μm for every 10 cm distance in the direction connecting the one end and the other end of the intermediate film. Specifically, the portion of the uniform thickness is a portion where the thickness does not change at all in the direction connecting the one end of the intermediate film and the other end, or in the direction connecting the one end of the intermediate film and the other end. Every 10 cm distance range, the thickness change is less than 10 μm. From the viewpoint of practicality and the viewpoint of sufficiently improving the adhesion and penetration resistance, the maximum thickness of the surface layer is preferably 0.001 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more, and more preferably It is 1 mm or less, more preferably 0.8 mm or less. From the viewpoint of practicality and the viewpoint of sufficiently improving penetration resistance, the maximum thickness of the layer (intermediate layer) arranged between the two surface layers is preferably 0.001 mm or more, more preferably 0.1 mm or more, and more It is preferably 0.2 mm or more, more preferably 0.8 mm or less, more preferably 0.6 mm or less, and still more preferably 0.3 mm or less. The distance X between one end of the intermediate film and the other end is preferably 3 m or less, more preferably 2 m or less, particularly preferably 1.5 m or less, and preferably 0.5 m or more, more preferably 0.8 m or more, and particularly preferably Above 1 m. Hereinafter, the details of each layer of the multilayer intermediate film and the materials constituting the single-layer intermediate film will be described. (Resin) The intermediate film preferably contains a resin. The said resin may use only 1 type, and may use 2 or more types together. As said resin, thermosetting resin and thermoplastic resin are mentioned. The interlayer film preferably contains a resin (hereinafter, sometimes referred to as resin (0)). The interlayer film preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (0)). The interlayer film preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (0)) as the thermoplastic resin (0). It is preferable that the said 1st layer contains resin (Hereinafter, it may describe as resin (1)). It is preferable that the said 1st layer contains a thermoplastic resin (Hereinafter, it may describe as a thermoplastic resin (1)). The above-mentioned first layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (1)) as the thermoplastic resin (1). It is preferable that the said 2nd layer contains resin (Hereinafter, it may describe as resin (2)). It is preferable that the said 2nd layer contains a thermoplastic resin (Hereinafter, it may describe as a thermoplastic resin (2)). The second layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (2)) as the thermoplastic resin (2). It is preferable that the said 3rd layer contains resin (Hereinafter, it may describe as resin (3)). It is preferable that the said 3rd layer contains a thermoplastic resin (Hereinafter, it may describe as a thermoplastic resin (3)). The third layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (3)) as the thermoplastic resin (3). The resin (1), the resin (2), and the resin (3) may be the same or different. It is preferable that the above-mentioned resin (1) is different from the above-mentioned resin (2) and the above-mentioned resin (3) in terms of further improving sound insulation properties. The thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic resin (3) may be the same or different. It is preferable that the above-mentioned thermoplastic resin (1) is different from the above-mentioned thermoplastic resin (2) and the above-mentioned thermoplastic resin (3) in terms of further improving sound insulation properties. The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may be the same or different. It is preferable that the said polyvinyl acetal resin (1) is different from the said polyvinyl acetal resin (2) and the said polyvinyl acetal resin (3) in terms of sound insulation properties further improved. The said thermoplastic resin (0), the said thermoplastic resin (1), the said thermoplastic resin (2), and the said thermoplastic resin (3) may use only 1 type, respectively, and may use 2 or more types together. The polyvinyl acetal resin (0), the polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may each use only one type or two Combine more than one species. As said thermoplastic resin, a polyvinyl acetal resin, a polyester resin, an ethylene-vinyl acetate copolymer resin, an ethylene-acrylic acid copolymer resin, a polyurethane resin, a polyvinyl alcohol resin, etc. are mentioned. Thermoplastic resins other than these can also be used. In addition, polyoxymethylene (or polyacetal) resin is contained in polyvinyl acetal resin. The above-mentioned resin is preferably a thermoplastic resin. The above-mentioned thermoplastic resin is more preferably a polyvinyl acetal resin or a polyester resin, and still more preferably a polyvinyl acetal resin. By using a polyvinyl acetal resin and a plasticizer in combination, the adhesive force of the interlayer film of the present invention to a laminated glass member or other interlayer films is further increased. The polyvinyl acetal resin is preferably a polyvinyl butyral resin. The above-mentioned polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol (PVA) with aldehyde. The polyvinyl acetal resin is preferably an acetal product of polyvinyl alcohol. The above-mentioned polyvinyl alcohol is obtained, for example, by saponifying polyvinyl acetate. The degree of saponification of the above-mentioned polyvinyl alcohol is generally in the range of 70 to 99.9 mol%. The average degree of polymerization of the above-mentioned polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, still more preferably 1500 or more, still more preferably 1600 or more, particularly preferably 2600 or more, most preferably 2700 or more, and It is preferably 5000 or less, more preferably 4000 or less, and still more preferably 3500 or less. If the above-mentioned average degree of polymerization is equal to or greater than the above-mentioned lower limit, the penetration resistance of the laminated glass will further increase. If the average degree of polymerization is equal to or less than the upper limit, the formation of the intermediate film becomes easier. The average degree of polymerization of the above-mentioned polyvinyl alcohol is determined by a method based on JIS K6726 "Test Method for Polyvinyl Alcohol". The carbon number of the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used in the production of the polyvinyl acetal resin is not particularly limited. The carbon number of the acetal group in the polyvinyl acetal resin is preferably 3 to 5, more preferably 3 or 4. If the carbon number of the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the interlayer film is sufficiently low. The carbon number of the acetal group in the polyvinyl acetal resin may be 4 or 5. The above-mentioned aldehyde is not particularly limited. Generally speaking, aldehydes with 1-10 carbon atoms can be preferably used. Examples of the aldehydes having 1 to 10 carbon atoms include formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexanal, n-octanal, n- Nonanal, n-decanal and benzaldehyde, etc. Preferably it is propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexanal or n-valeraldehyde, more preferably propionaldehyde, n-butyraldehyde or isobutyraldehyde, and still more preferably n-butyraldehyde. As for the said aldehyde, only 1 type may be used, and 2 or more types may be used together. The hydroxyl content (hydroxyl amount) of the polyvinyl acetal resin (0) is preferably 15 mol% or more, more preferably 18 mol% or more, and preferably 40 mol% or less, more preferably 35 mol% Mole% or less. If the content of the hydroxyl group is higher than the lower limit, the adhesive force of the interlayer film will further increase. In addition, if the content of the hydroxyl group is equal to or lower than the upper limit, the flexibility of the interlayer film becomes higher, and the handling of the interlayer film becomes easier. The hydroxyl content (hydroxyl amount) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, and still more preferably 22 mol% or more. The hydroxyl content (hydroxyl amount) of the polyvinyl acetal resin (1) is preferably 30 mol% or less, more preferably 28 mol% or less, still more preferably 27 mol% or less, and still more preferably 25 mol% or less, particularly preferably less than 25 mol%, and most preferably 24 mol% or less. If the content of the hydroxyl group is greater than or equal to the lower limit, the mechanical strength of the interlayer film will further increase. In particular, if the hydroxyl content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent, and if it is 28 mol% or less, the sound insulation of the laminated glass The performance is further improved, and if it is 28 mol% or less, the sound insulation performance is further improved. In addition, if the content of the hydroxyl group is equal to or lower than the upper limit, the flexibility of the interlayer film becomes higher, and the handling of the interlayer film becomes easier. The content of each hydroxyl group of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, and more preferably 30 mol% The above, more preferably more than 31 mol%, still more preferably 31.5 mol% or more, still more preferably 32 mol% or more, and particularly preferably 33 mol% or more. The content of each hydroxyl group of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 38 mol% or less, more preferably 37 mol% or less, and still more preferably 36.5 mol% % Or less, particularly preferably 36 mol% or less. If the content of the hydroxyl group is higher than the lower limit, the adhesive force of the interlayer film will further increase. In addition, if the content of the hydroxyl group is equal to or lower than the upper limit, the flexibility of the interlayer film becomes higher, and the handling of the interlayer film becomes easier. From the viewpoint of further improving sound insulation properties, the hydroxyl content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl content of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation properties, the hydroxyl content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl content of the polyvinyl acetal resin (3). From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (2) is preferably 1 mole. Ear% or more, more preferably 5 mol% or more, still more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (3) is preferably 1 mole. Ear% or more, more preferably 5 mol% or more, still more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (2) is preferably 20 mol% or less. The absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (3) is preferably 20 mol% or less. Regarding the hydroxyl content of the polyvinyl acetal resin, the molar fraction is expressed as a percentage by dividing the amount of ethylene groups bonded with hydroxyl groups by the total amount of ethylene groups in the main chain. The amount of ethylene groups to which the hydroxyl group is bonded can be measured in accordance with, for example, JIS K6728 "Testing method for polyvinyl butyral". The degree of acetylation (amount of acetyl group) of the polyvinyl acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, still more preferably 0.5 mol% or more, and more It is preferably 30 mol% or less, more preferably 25 mol% or less, and still more preferably 20 mol% or less. If the degree of acetylation is greater than or equal to the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. If the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass becomes high. The degree of acetylation (amount of acetyl group) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, still more preferably 7 mol% or more, and more It is preferably 9 mol% or more, more preferably 30 mol% or less, more preferably 25 mol% or less, still more preferably 24 mol% or less, and particularly preferably 20 mol% or less. If the degree of acetylation is greater than or equal to the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. If the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass becomes high. In particular, when the degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent. Each degree of acetylation of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, and preferably 10 mol% % Or less, more preferably 2 mol% or less. If the degree of acetylation is greater than or equal to the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. If the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass becomes high. The above-mentioned acetylation degree is expressed as a percentage by the molar fraction obtained by dividing the amount of ethylene groups bonded with acetyl groups by the total amount of ethylene groups of the main chain. The amount of ethylene groups to which the acetyl group is bonded can be measured in accordance with, for example, JIS K6728 "Testing method for polyvinyl butyral". The degree of acetalization of the polyvinyl acetal resin (0) (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 60 mol% or more, more preferably 63 mol% or more, and It is preferably 85 mol% or less, more preferably 75 mol% or less, and still more preferably 70 mol% or less. If the degree of acetalization is greater than or equal to the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. If the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin becomes shorter. The degree of acetalization of the polyvinyl acetal resin (1) (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 47 mol% or more, more preferably 60 mol% or more, and It is preferably 85 mol% or less, more preferably 80 mol% or less, and still more preferably 75 mol% or less. If the degree of acetalization is greater than or equal to the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. If the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin becomes shorter. The degree of acetalization of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 55 mol% or more , More preferably 60 mol% or more, more preferably 75 mol% or less, more preferably 71 mol% or less. If the degree of acetalization is greater than or equal to the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. If the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin becomes shorter. The degree of acetalization is determined as follows. First, obtain the value obtained by subtracting the amount of ethylene groups bonded with hydroxyl groups and the amount of ethylene groups bonded with acetyl groups from the total ethylene group of the main chain. Divide the obtained value by the total ethyl ethylene amount of the main chain to obtain the molar fraction. The value of the molar fraction expressed as a percentage is the degree of acetalization. Furthermore, the above-mentioned hydroxyl content (hydroxyl amount), degree of acetalization (degree of butyralization), and degree of acetylation are preferably measured by a method based on JIS K6728 "Test Method for Polyvinyl Butyral" The result is calculated. Among them, the measurement based on ASTM D1396-92 can also be used. In the case where the polyvinyl acetal resin is a polyvinyl butyral resin, the content of the hydroxyl group (hydroxyl amount), the degree of acetalization (the degree of butyralization), and the degree of acetylation can be determined based on JIS K6728 "Test Method for Polyvinyl Butyral" is calculated based on the results obtained. (Plasticizer) From the viewpoint of further improving the adhesive force of the interlayer film, the interlayer film of the present invention preferably contains a plasticizer (hereinafter, it may be described as a plasticizer (0)). It is preferable that the said 1st layer contains a plasticizer (Hereinafter, it may be described as a plasticizer (1)). It is preferable that the said 2nd layer contains a plasticizer (Hereinafter, it may be described as a plasticizer (2)). It is preferable that the said 3rd layer contains a plasticizer (Hereinafter, it may describe as a plasticizer (3)). When the thermoplastic resin contained in the intermediate film is a polyvinyl acetal resin, the intermediate film (each layer) preferably contains a plasticizer. The layer containing polyvinyl acetal resin preferably contains a plasticizer. The above-mentioned plasticizer is not particularly limited. As the above-mentioned plasticizer, conventionally known plasticizers can be used. As for the said plasticizer, only 1 type may be used, and 2 or more types may be used together. Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and organic phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers. Preferably, it is an organic ester plasticizer. The above-mentioned plasticizer is preferably a liquid plasticizer. As said monobasic organic acid ester, the glycol ester obtained by reaction of a diol and a monobasic organic acid, etc. are mentioned. As said diol, triethylene glycol, tetraethylene glycol, tripropylene glycol, etc. are mentioned. Examples of the monobasic organic acid include butyric acid, isobutyric acid, hexanoic acid, 2-ethylbutyric acid, heptanoic acid, n-octanoic acid, 2-ethylhexanoic acid, n-nonanoic acid, capric acid, benzoic acid, and the like. Examples of the above-mentioned polybasic organic acid esters include polybasic organic acids and ester compounds with alcohols having a linear or branched structure having 4 to 8 carbon atoms. As said polybasic organic acid, adipic acid, sebacic acid, azelaic acid, etc. are mentioned. Examples of the above-mentioned organic ester plasticizer include: triethylene glycol bis (2-ethyl propionate), triethylene glycol bis (2-ethyl butyrate), and triethylene glycol bis (2-ethyl propionate). Hexanoate), triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate Ester, dioctyl sebacate, dibutyl carbitol adipate, ethylene glycol bis(2-ethylbutyrate), 1,3-propanediol bis(2-ethylbutyrate), 1,4-Butanediol bis(2-ethylbutyrate), diethylene glycol bis(2-ethylbutyrate), diethylene glycol bis(2-ethylhexanoate), dipropylene glycol Di(2-ethylbutyrate), triethylene glycol bis(2-ethylvalerate), tetraethylene glycol bis(2-ethylbutyrate), diethylene glycol dioctanoate, Diethylene glycol dibenzoate, dipropylene glycol dibenzoate, dihexyl adipate, dioctyl adipate, cyclohexyl adipate, heptyl adipate and adipic acid Mixture of nonyl ester, diisononyl adipate, diisodecyl adipate, nonyl heptyl adipate, dibutyl sebacate, oil-modified sebacic acid alkyd, and phosphate and hexyl Mixtures of diacid esters, etc. Organic ester plasticizers other than these can also be used. Other adipic acid esters other than the above-mentioned adipic acid esters can also be used. As said organic phosphoric acid plasticizer, tributoxy ethyl phosphate, isodecyl phenyl phosphate, triisopropyl phosphate, etc. are mentioned. The plasticizer is preferably a diester plasticizer represented by the following formula (1). [化1]
Figure 02_image001
In the above formula (1), R1 and R2 each represent an organic group having 5 to 10 carbon atoms, R3 represents an ethylidene group, an isopropylidene group or an n-propylidene group, and p represents an integer of 3-10. R1 and R2 in the above formula (1) are each preferably an organic group having 6 to 10 carbon atoms. The above-mentioned plasticizer preferably contains triethylene glycol bis(2-ethylhexanoate) (3GO), triethylene glycol bis(2-ethylbutyrate) (3GH) or triethylene glycol bis( 2-ethyl propionate). The above-mentioned plasticizer more preferably contains triethylene glycol bis(2-ethylhexanoate) (3GO) or triethylene glycol bis(2-ethylbutyrate) (3GH), and more preferably contains three Ethylene glycol bis(2-ethylhexanoate). From the viewpoint of further effectively suppressing partial wedge angle changes during the production of laminated glass, and further effectively suppressing double images in the laminated glass, the interlayer film of the present invention is preferably provided with a thermoplastic resin and a relative A layer of plasticizer with a content of 25 parts by weight or more and 45 parts by weight or less in 100 parts by weight of the above-mentioned thermoplastic resin. In this case, the content of the plasticizer in the layer containing the thermoplastic resin and the plasticizer is more preferably 35 parts by weight or less, further preferably 32 parts by weight or less, and particularly preferably 30 parts by weight or less. In the intermediate film, the plasticizer (0) is relative to 100 parts by weight of the resin (0) (when the resin (0) is a thermoplastic resin (0), 100 parts by weight of the thermoplastic resin (0) ; When the resin (0) is a polyvinyl acetal resin (0), the content of the polyvinyl acetal resin (0) 100 parts by weight) is set as the content (0). The above content (0) is preferably 25 parts by weight or more, more preferably 30 parts by weight or more, and preferably 100 parts by weight or less, more preferably 60 parts by weight or less, and still more preferably 50 parts by weight or less. If the content of the plasticizer (0) is greater than or equal to the above lower limit, the penetration resistance of the laminated glass will further increase. If the content of the plasticizer (0) is equal to or less than the upper limit, the transparency of the interlayer film will further increase. Furthermore, if the content of the plasticizer (0) is above the above lower limit and below the above upper limit, the change in the partial wedge angle can be further effectively suppressed when the laminated glass is produced, and the double in the laminated glass can be further effectively suppressed. image. In the first layer, the plasticizer (1) is relative to 100 parts by weight of the resin (1) (when the resin (1) is a thermoplastic resin (1), 100 parts by weight of the thermoplastic resin (1) Parts; when the above-mentioned resin (1) is a polyvinyl acetal resin (1), the content of the above-mentioned polyvinyl acetal resin (1) (100 parts by weight) is set as the content (1). The above content (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, still more preferably 60 parts by weight or more, and preferably 100 parts by weight or less, more preferably 90 parts by weight or less, and still more preferably It is 85 parts by weight or less, and more preferably 80 parts by weight or less. If the above content (1) is more than the above lower limit, the flexibility of the interlayer film becomes high, and the handling of the interlayer film becomes easier. If the aforementioned content (1) is equal to or less than the aforementioned upper limit, the penetration resistance of the laminated glass will further increase. In the second layer, the plasticizer (2) is relative to 100 parts by weight of the resin (2) (when the resin (2) is a thermoplastic resin (2), 100 parts by weight of the thermoplastic resin (2) Parts; when the resin (2) is a polyvinyl acetal resin (2), the content of the polyvinyl acetal resin (2) 100 parts by weight) is set as the content (2). In the third layer, the plasticizer (3) is relative to 100 parts by weight of the resin (3) (when the resin (3) is a thermoplastic resin (3), 100 parts by weight of the thermoplastic resin (3) Parts; when the above-mentioned resin (3) is a polyvinyl acetal resin (3), the content of the above-mentioned polyvinyl acetal resin (3) (100 parts by weight) is set as the content (3). The content (2) and the content (3) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, still more preferably 20 parts by weight or more, particularly preferably 24 parts by weight or more, and most preferably 25 parts by weight Copies or more. The content (2) and the content (3) are each preferably 45 parts by weight or less, more preferably 40 parts by weight or less, still more preferably 35 parts by weight or less, particularly preferably 32 parts by weight or less, and most preferably 30 parts by weight The following. If the above content (2) and the above content (3) are more than the above lower limit, the flexibility of the interlayer film becomes high, and the handling of the interlayer film becomes easier. If the above content (2) and the above content (3) are equal to or less than the above upper limit, the penetration resistance of the laminated glass will further increase. In order to improve the sound insulation of the laminated glass, the above content (1) is preferably more than the above content (2), and the above content (1) is preferably more than the above content (3). From the viewpoint of further improving the sound insulation of laminated glass, the absolute value of the difference between the above content (2) and the above content (1), and the absolute value of the difference between the above content (3) and the above content (1) are respectively compared It is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and still more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 80 parts by weight or less, more preferably 75 parts by weight or less , And more preferably 70 parts by weight or less. (Heat-shielding substance) The intermediate film preferably contains a heat-shielding substance. The above-mentioned first layer preferably contains a heat shielding substance. The above-mentioned second layer preferably contains a heat shielding substance. The third layer preferably contains a heat shielding substance. As for the said heat shielding substance, only 1 type may be used, and 2 or more types may be used together. The heat-shielding substance preferably contains at least one component X of a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound, or contains heat-shielding particles. In this case, you may include both the said component X and the said heat shielding particle. Component X: The intermediate film preferably contains at least one component X of a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound. It is preferable that the said 1st layer contains the said component X. It is preferable that the said 2nd layer contains the said component X. It is preferable that the said 3rd layer contains the said component X. The above-mentioned component X is a heat shielding substance. As for the said component X, only 1 type may be used, and 2 or more types may be used together. The said component X is not specifically limited. As the component X, previously known phthalocyanine compounds, naphthalocyanine compounds, and anthracyanine compounds can be used. As said component X, phthalocyanine, derivatives of phthalocyanine, naphthalocyanine, derivatives of naphthalocyanine, derivatives of anthracyanine and anthracyanine, etc. are mentioned. The phthalocyanine compound and the derivative of the phthalocyanine each preferably have a phthalocyanine skeleton. The naphthalocyanine compound and the derivative of the naphthalocyanine each preferably have a naphthalocyanine skeleton. The anthracyanine compound and the anthracyanine derivative each preferably have an anthracyanine skeleton. From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, the above component X is preferably selected from the group consisting of phthalocyanine, derivatives of phthalocyanine, naphthalocyanine and derivatives of naphthalocyanine At least one, more preferably at least one of phthalocyanine and phthalocyanine derivatives. From the viewpoint of effectively improving heat shielding properties and maintaining visible light transmittance at a higher level for a long period of time, the above-mentioned component X preferably contains vanadium atoms or copper atoms. The above-mentioned component X preferably contains vanadium atoms, and also preferably contains copper atoms. The above-mentioned component X is more preferably at least one of a phthalocyanine containing vanadium atom or copper atom and a derivative of phthalocyanine containing vanadium atom or copper atom. From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, the above-mentioned component X preferably has a structural unit in which an oxygen atom is bonded to a vanadium atom. In 100% by weight of the intermediate film or in 100% by weight of the layer (the first layer, the second layer, or the third layer) containing the component X, the content of the component X is preferably 0.001% by weight or more, more preferably 0.005% by weight % Or more, more preferably 0.01% by weight or more, and particularly preferably 0.02% by weight or more. In 100% by weight of the intermediate film or in 100% by weight of the layer (the first layer, the second layer, or the third layer) containing the component X, the content of the component X is preferably 0.2% by weight or less, more preferably 0.1% by weight % Or less, more preferably 0.05% by weight or less, and particularly preferably 0.04% by weight or less. If the content of the component X is greater than or equal to the aforementioned lower limit and less than or equal to the aforementioned upper limit, the heat shielding property will be sufficiently high, and the visible light transmittance will be sufficiently high. For example, the visible light transmittance can be made 70% or more. Heat shielding particles: The intermediate film preferably contains heat shielding particles. The first layer preferably contains the heat shielding particles. The second layer preferably contains the heat shielding particles. The third layer preferably contains the heat shielding particles. The heat-shielding particles are heat-shielding materials. By using heat-shielding particles, infrared rays (heat rays) can be effectively blocked. As for the said heat shielding particle, only 1 type may be used, and 2 or more types may be used together. From the viewpoint of further improving the heat shielding properties of the laminated glass, the heat shielding particles are more preferably metal oxide particles. The heat shielding particles are preferably particles formed of metal oxides (metal oxide particles). Infrared rays with a wavelength longer than 780 nm, which are longer than visible light, have less energy than ultraviolet rays. However, the heat effect of infrared rays is greater. If infrared rays are absorbed by substances, they will be released in the form of heat. Therefore, infrared rays are generally called hot wires. By using the above heat shielding particles, infrared rays (heat rays) can be effectively shielded. Furthermore, the so-called heat-shielding particles mean particles that can absorb infrared rays. Specific examples of the aforementioned heat shielding particles include aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), and indium-doped zinc oxide particles ( IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, tin-doped indium oxide particles ( ITO particles), metal oxide particles such as tin-doped zinc oxide particles, silicon-doped zinc oxide particles, or lanthanum hexaboride (LaB 6 ) particles, etc. Heat shielding particles other than these can also be used. The metal oxide particles are preferred due to the higher shielding function of the heating wire, more preferably ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles, and particularly preferably ITO particles or tungsten oxide particles. In particular, tin-doped indium oxide particles (ITO particles) are preferred because of the higher shielding function of the hot ray and easy acquisition, and tungsten oxide particles are also preferred. From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, the tungsten oxide particles are preferably metal-doped tungsten oxide particles. The above-mentioned "tungsten oxide particles" includes metal-doped tungsten oxide particles. Specific examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, and the like. From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, cesium-doped tungsten oxide particles are particularly preferred. From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, the cesium-doped tungsten oxide particles are preferably tungsten oxide particles represented by the formula: Cs 0.33 WO 3 . The average particle diameter of the heat shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, and preferably 0.1 μm or less, and more preferably 0.05 μm or less. If the average particle size is greater than or equal to the above lower limit, the shielding properties of the heat rays will be sufficiently increased. If the average particle size is equal to or less than the above upper limit, the dispersibility of the heat shielding particles becomes higher. The above-mentioned "average particle diameter" means the volume average particle diameter. The average particle size can be measured using a particle size distribution measuring device ("UPA-EX150" manufactured by Nikkiso Co., Ltd.) or the like. In 100% by weight of the above-mentioned intermediate film or in 100% by weight of the layer (the first layer, the second layer or the third layer) containing the heat shielding particles, the content of the heat shielding particles (especially the content of tungsten oxide particles) is more than It is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, still more preferably 1% by weight or more, and particularly preferably 1.5% by weight or more. In 100% by weight of the above-mentioned intermediate film or in 100% by weight of the layer (the first layer, the second layer or the third layer) containing the heat shielding particles, the content of the heat shielding particles (especially the content of tungsten oxide particles) is more than It is preferably 6% by weight or less, more preferably 5.5% by weight or less, still more preferably 4% by weight or less, particularly preferably 3.5% by weight or less, and most preferably 3% by weight or less. If the content of the heat-shielding particles is greater than or equal to the aforementioned lower limit and less than or equal to the aforementioned upper limit, the heat-shielding property becomes sufficiently high, and the visible light transmittance becomes sufficiently high. (Metal salt) The interlayer film preferably contains at least one metal salt of an alkali metal salt, an alkaline earth metal salt, and a magnesium salt (hereinafter, it may be described as a metal salt M). The first layer preferably contains the metal salt M. The second layer preferably contains the metal salt M described above. The third layer preferably contains the metal salt M. By using the above-mentioned metal salt M, it becomes easy to control the adhesiveness between the interlayer film and laminated glass members such as a glass plate or the adhesiveness between each layer in the interlayer film. The said metal salt M may use only 1 type, and may use 2 or more types together. The metal salt M preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, and Ba. The metal salt contained in the intermediate film preferably contains at least one of K and Mg. In addition, the metal salt M is more preferably an alkali metal salt of an organic acid having 2 to 16 carbons, an alkaline earth metal salt of an organic acid having 2 to 16 carbons, or a magnesium salt of an organic acid having 2 to 16 carbons, and more preferably It is a magnesium salt of a carboxylate having 2 to 16 carbons or a potassium salt of a carboxylate having 2 to 16 carbons. Examples of the magnesium carboxylate salt having 2 to 16 carbon atoms and the potassium carboxylate salt having 2 to 16 carbon atoms include: magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, Potassium 2-ethylbutyrate, magnesium 2-ethylhexanoate, potassium 2-ethylhexanoate, etc. The total content of Mg and K in the intermediate film containing the metal salt M or the layer containing the metal salt M (the first layer, the second layer, or the third layer) is preferably 5 ppm or more, more preferably 10 ppm or more, more preferably 20 ppm or more, and more preferably 300 ppm or less, more preferably 250 ppm or less, and still more preferably 200 ppm or less. If the total content of Mg and K is more than the above lower limit and below the above upper limit, the adhesiveness between the interlayer film and the glass plate or the adhesiveness between the layers in the interlayer film can be further controlled well. (Ultraviolet shielding agent) The intermediate film preferably contains an ultraviolet shielding agent. The above-mentioned first layer preferably contains an ultraviolet shielding agent. The above-mentioned second layer preferably contains an ultraviolet shielding agent. The third layer preferably contains an ultraviolet shielding agent. By using an ultraviolet shielding agent, even if the interlayer film and laminated glass are used for a long time, the visible light transmittance is difficult to further decrease. The said ultraviolet shielding agent may use only 1 type, and may use 2 or more types together. An ultraviolet absorber is contained in the said ultraviolet shielding agent. The aforementioned ultraviolet shielding agent is preferably an ultraviolet absorber. Examples of the aforementioned ultraviolet shielding agent include: ultraviolet shielding agent containing metal atoms, ultraviolet shielding agent containing metal oxide, ultraviolet shielding agent having a benzotriazole structure (benzotriazole compound), and having benzophenone Structured ultraviolet shielding agent (benzophenone compound), ultraviolet shielding agent with tris structure (tris compound), ultraviolet shielding agent with malonate structure (malonate compound), with oxaniline structure The ultraviolet shielding agent (oxaniline compound) and the ultraviolet shielding agent with benzoate structure (benzoate compound), etc. Examples of the ultraviolet shielding agent containing metal atoms include platinum particles, platinum particles whose surfaces are coated with silicon dioxide, palladium particles, and palladium particles whose surfaces are coated with silicon dioxide. The ultraviolet shielding agent is preferably not a heat shielding particle. The above-mentioned ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure, an ultraviolet shielding agent having a tri-structure, or an ultraviolet shielding agent having a benzoate structure. The above-mentioned ultraviolet shielding agent is more preferably an ultraviolet shielding agent having a benzotriazole structure or an ultraviolet shielding agent having a benzophenone structure, and more preferably an ultraviolet shielding agent having a benzotriazole structure. Examples of the ultraviolet shielding agent containing the metal oxide include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the ultraviolet shielding agent containing the metal oxide may be surface-coated. Examples of the coating material for the surface of the ultraviolet shielding agent containing the metal oxide include insulating metal oxides, hydrolyzable organosilicon compounds, and silicone compounds. As said insulating metal oxide, silicon dioxide, aluminum oxide, zirconium oxide, etc. are mentioned. The insulating metal oxide has, for example, a band gap energy of 5.0 eV or more. As the ultraviolet shielding agent having a benzotriazole structure, for example, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole ("Tinuvin P" manufactured by BASF Corporation), 2- (2'-hydroxy-3',5'-di-tert-butylphenyl) benzotriazole ("Tinuvin 320" manufactured by BASF), 2-(2'-hydroxy-3'-tert-butyl -5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF), and 2-(2'-hydroxy-3',5'-di-pentylphenyl)benzene Triazole (“Tinuvin 328” manufactured by BASF Company), etc. In terms of excellent performance in shielding ultraviolet rays, the above-mentioned ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure containing a halogen atom, and more preferably an ultraviolet shielding agent having a benzotriazole structure containing a chlorine atom . As the ultraviolet shielding agent having a benzophenone structure, for example, octanophenone ("Chimassorb 81" manufactured by BASF Corporation) and the like can be cited. As the aforementioned ultraviolet shielding agent having a tri-structure, for example, "LA-F70" manufactured by ADEKA and 2-(4,6-diphenyl-1,3,5-tris-2-yl)- 5-[(hexyl)oxy]-phenol ("Tinuvin 1577FF" manufactured by BASF Corporation) and the like. Examples of the ultraviolet shielding agent having a malonate structure include: dimethyl 2-(p-methoxybenzylidene)malonate, 2,2-(1,4-phenylene dimethylene) ) Tetraethyl bismalonate, 2-(p-methoxybenzylidene)-bis(1,2,2,6,6-pentamethyl 4-piperidinyl)malonate and the like. Examples of commercially available products of the ultraviolet shielding agent having a malonate structure include Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant). Examples of the ultraviolet shielding agent having the oxaniline structure include: N-(2-ethylphenyl)-N'-(2-ethoxy-5-tert-butylphenyl) oxalamide, N-(2-ethylphenyl)-N'-(2-ethoxy-phenyl) oxalic acid diamide, 2-ethyl-2'-ethoxy-oxyanilide (manufactured by Clariant) "SanduvorVSU") and other oxalic acid diamides with aryl groups substituted on the nitrogen atom. As the ultraviolet shielding agent having a benzoate structure, for example, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate (manufactured by BASF Corporation) "Tinuvin 120") and so on. In 100% by weight of the intermediate film or in 100% by weight of the layer (the first layer, the second layer, or the third layer) containing the ultraviolet shielding agent, the content of the ultraviolet shielding agent and the content of the benzotriazole compound are preferably 0.1% by weight or more, more preferably 0.2% by weight or more, still more preferably 0.3% by weight or more, and particularly preferably 0.5% by weight or more. In 100% by weight of the intermediate film or in 100% by weight of the layer (the first layer, the second layer, or the third layer) containing the ultraviolet shielding agent, the content of the ultraviolet shielding agent and the content of the benzotriazole compound are preferably 2.5% by weight or less, more preferably 2% by weight or less, still more preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. If the content of the ultraviolet shielding agent is above the above lower limit and below the above upper limit, the decrease in the visible light transmittance after the period has elapsed can be further suppressed. In particular, in 100% by weight of the layer containing the above-mentioned ultraviolet shielding agent, the content of the above-mentioned ultraviolet shielding agent is 0.2% by weight or more, which can significantly suppress the decrease in the visible light transmittance after the interlayer film and the laminated glass have elapsed. (Antioxidant) The intermediate film preferably contains an antioxidant. The above-mentioned first layer preferably contains an antioxidant. The above-mentioned second layer preferably contains an antioxidant. The third layer preferably contains an antioxidant. As for the said antioxidant, only 1 type may be used, and 2 or more types may be used together. Examples of the antioxidants include phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. The above-mentioned phenol-based antioxidant is an antioxidant having a phenol skeleton. The sulfur-based antioxidant is an antioxidant containing sulfur atoms. The above-mentioned phosphorus antioxidant is an antioxidant containing phosphorus atoms. The antioxidant is preferably a phenol-based antioxidant or a phosphorus-based antioxidant. Examples of the phenol-based antioxidants include 2,6-di-tert-butyl-p-cresol (BHT), butylhydroxyanisole (BHA), and 2,6-di-tert-butyl-4-ethyl Phenol, β-(3,5-di-tert-butyl-4-hydroxyphenyl) stearyl propionate, 2,2'-methylene-(4-methyl-6-butylphenol), 2 , 2'-methylene-(4-ethyl-6-tertiary butylphenol), 4,4'-butylene-bis-(3-methyl-6-tertiary butylphenol), 1, 1,3-Tris-(2-methyl-hydroxy-5-tert-butylphenyl)butane, tetrakis(methylene-3-(3',5'-butyl-4-hydroxyphenyl) Propionate) methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-tert-butylphenol)butane, 1,3,5-trimethyl-2,4,6 -Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, bis(3,3'-tert-butylphenol) butyric acid glycol ester and bis(3-tert-butyl-4- Hydroxy-5-methylphenylpropionic acid) ethylene bis (oxyethylene) and the like. One or more of these antioxidants can be preferably used. Examples of the phosphorus antioxidant include: tridecyl phosphite, tris(tridecyl) phosphite, triphenyl phosphite, trinonylphenyl phosphite, and bis(tridecyl) phosphite. Base) pentaerythritol diphosphite, bis(decyl) pentaerythritol diphosphite, tris(2,4-di-tertiary butylphenyl) phosphite, bis(2,4-di-tertiary butyl) phosphite -6-methylphenyl)ethyl ester, and 2,2'-methylene(4,6-di-tert-butyl-1-phenoxy)(2-ethylhexyloxy)phosphorus and the like. One or more of these antioxidants can be preferably used. Commercial products of the aforementioned antioxidants include, for example, "IRGANOX 245" manufactured by BASF, "IRGAFOS 168" manufactured by BASF, "IRGAFOS 38" manufactured by BASF, and "Sumilizer BHT" manufactured by Sumitomo Chemical Industries, Ltd. , And "IRGANOX 1010" manufactured by BASF company. In order to maintain the high visible light transmittance of the interlayer film and laminated glass for a long time, 100% by weight of the above-mentioned interlayer film or 100% by weight of the layer (the first layer, the second layer or the third layer) containing the anti-oxidant, the above-mentioned anti-oxidant The content of the oxidizing agent is preferably 0.1% by weight or more. Furthermore, since the effect of the addition of the antioxidant is saturated, the content of the antioxidant in 100% by weight of the intermediate film or in the layer containing the antioxidant is preferably 2% by weight or less. (Other components) The intermediate film, the first layer, the second layer, and the third layer may optionally contain coupling agents, dispersants, surfactants, flame retardants, antistatic agents, pigments, dyes, Additives such as adhesive modifiers, moisture resistant agents, fluorescent brighteners and infrared absorbers other than metal salts. These additives may use only 1 type, and may use 2 or more types together. (Laminated glass) Fig. 3 is a cross-sectional view showing an example of laminated glass using the interlayer film for laminated glass shown in Fig. 1. The laminated glass 21 shown in FIG. 3 includes an intermediate film portion 11X, a first laminated glass member 22, and a second laminated glass member 23. The intermediate film portion 11X is arranged and sandwiched between the first laminated glass member 22 and the second laminated glass member 23. The first laminated glass member 22 is arranged on the first surface of the intermediate film portion 11X. The second laminated glass member 23 is arranged on the second surface opposite to the first surface of the intermediate film portion 11X. The intermediate film portion 11A is formed by the intermediate film 11 shown in FIG. 1. The intermediate film portion 11A includes a first layer 1X derived from the first layer 1, a second layer 2X derived from the second layer, and a third layer 3X derived from the third layer. The first layer 1X is formed by the first layer 1. The second layer 2X is formed by the second layer 2. The third layer 3X is formed by the third layer 3. As said laminated glass member, a glass plate, a PET (polyethylene terephthalate) film, etc. are mentioned. The above-mentioned laminated glass includes not only a laminated glass in which an intermediate film is sandwiched between two glass plates, but also a laminated glass in which an intermediate film is sandwiched between a glass plate and a PET film or the like. The laminated glass is a laminated body including glass plates, and it is preferable to use at least one glass plate. Preferably, the first laminated glass member and the second laminated glass member are each a glass plate or a PET (polyethylene terephthalate) film, and the intermediate film includes at least one glass plate as the first The laminated glass member and the above-mentioned second laminated glass member. It is particularly preferable that both the first laminated glass member and the second laminated glass member are glass plates. As said glass plate, inorganic glass and organic glass are mentioned. Examples of the above-mentioned inorganic glass include float plate glass, heat-absorbing plate glass, heat-reflecting plate glass, ground plate glass, template glass, wiring plate glass, green glass, and the like. The above-mentioned organic glass is a synthetic resin glass that replaces inorganic glass. As said organic glass, a polycarbonate board, a poly(meth)acrylic resin board, etc. are mentioned. As said poly(meth)acrylic resin board, polymethyl(meth)acrylate board etc. are mentioned. The thicknesses of the first laminated glass member and the second laminated glass member are not particularly limited, but are preferably 1 mm or more, and preferably 5 mm or less. When the above-mentioned laminated glass member is a glass plate, the thickness of the glass plate is preferably 1 mm or more, and preferably 5 mm or less. When the above-mentioned laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more, and preferably 0.5 mm or less. The manufacturing method of the said laminated glass is not specifically limited. First, the interlayer film is sandwiched between the first and second laminated glass members to obtain a laminate. Then, for example, the obtained laminate is passed through a pressing roller or placed in a rubber bag for vacuum suction, thereby leaving the residue between the first laminated glass member and the intermediate film, and the second laminated glass member and the intermediate film The air is degassed. Thereafter, pre-bonding is performed at about 70 to 110°C to obtain a pre-compression-bonded laminate. Then, the pre-compression-bonded laminate is put into an autoclave, or pressurized, and pressure-bonded at about 120-150°C and a pressure of 1-1.5 MPa. In this way, laminated glass can be obtained. The above-mentioned laminated glass can be used in automobiles, rail vehicles, aircraft, ships and buildings. The above-mentioned laminated glass is preferably a laminated glass for construction or a vehicle, and more preferably a laminated glass for a vehicle. The above-mentioned laminated glass can also be used for other purposes. The above-mentioned laminated glass can be used for windshield, side glass, rear glass or sunroof glass of automobiles. The above-mentioned laminated glass can be preferably used in automobiles due to its high heat shielding property and high visible light transmittance. The above-mentioned laminated glass is used as the laminated glass of a head-up display (HUD). In the above-mentioned laminated glass, the speed and other measurement information sent from the control unit can be reflected from the display unit of the dashboard to the windshield. Therefore, the driver of the car does not reduce the field of view, but can simultaneously recognize the field of view in front of the vehicle and the measurement information. Examples and comparative examples are disclosed below to further describe the present invention in detail. The present invention is not limited to these embodiments. Regarding the polyvinyl acetal resin used, n-butyraldehyde with 4 carbon atoms is used for acetalization. Regarding the polyvinyl acetal resin, the degree of acetalization (degree of butyralization), the degree of acetylation, and the content of hydroxyl groups are measured by a method based on JIS K6728 "Testing Methods for Polyvinyl Butyral". In addition, when measured by ASTM D1396-92, it also showed the same value as the method based on JIS K6728 "Test Method for Polyvinyl Butyral". (Example 1) Production of a composition for forming the first layer: The following blending ingredients were blended and thoroughly kneaded with a mixing roller to obtain a composition for forming the first layer. Other components are added to the polyvinyl acetal resin. Polyvinyl acetal resin (hydroxyl content 22 mol%, acetylation degree 13 mol%, acetalization degree 65 mol%) 100 parts by weight triethylene glycol bis(2-ethylhexanoate) (3GO) 60 parts by weight of Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF) 0.2 parts by weight of BHT (2,6-di-tert-butyl-p-cresol) 0.2 parts by weight is used to form the composition of the second layer and the third layer. A composition for forming the second layer and the third layer is obtained. Other components are added to the polyvinyl acetal resin. Polyvinyl acetal resin (hydroxyl content 30.5 mol%, acetylation degree 1 mol%, acetalization degree 68.5 mol%) 100 parts by weight triethylene glycol bis(2-ethylhexanoate) (3GO) 38 parts by weight of Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF) Production of 0.2 parts by weight of BHT (2,6-di-tert-butyl-p-cresol) 0.2 parts by weight of interlayer film before crimping: Using a co-extruder, combine the composition used to form the first layer and The composition forming the second layer and the third layer is co-extruded. In Example 1, after the intermediate film was extruded, the intermediate film was heated to 100°C to 150°C, maintained for a holding time within 5 minutes, and returned to normal temperature. A wedge-shaped interlayer film with a layered structure of the second layer/the first layer/the third layer is produced. Furthermore, the intermediate films obtained in the following Examples 2-12 and Comparative Examples 1-7 have the smallest thickness at one end and the largest thickness at the other end. Production of a laminate for measuring the wedge angle of a part of the interlayer film after formal crimping: Prepare a first glass plate with the same size as the interlayer film before crimping and a thickness of 2 mm. Prepare a second glass plate having the same size as the obtained interlayer film before crimping and a thickness of 2 mm. As the first glass plate and the second glass plate, float plate glass obtained in accordance with JIS 3202-2011 was used. (First step) Place the interlayer film before pressure bonding on the first glass plate from one surface side. Then, (the second step) on the intermediate film before crimping, one end of the second glass plate is aligned with one end of the intermediate film before crimping, and the surface direction of the second glass plate is aligned with the first glass The direction of the plate surface is at a right angle, and it is placed on the other surface of the interlayer film before crimping. Then (the third step) while fixing the one end of the second glass plate, tilt the second glass plate so that the surface of the second glass plate is in contact with the other surface of the interlayer film before the pressure bonding, and The second glass is set to a state where the weight of the second glass is balanced on the other surface of the interlayer film before the pressure bonding. After that, (the fourth step), pre-compression bonding was performed by roll pressing at 240°C and a line pressure of 98 N/cm. Then, (the fifth step), perform formal crimping at 140°C and a pressure of 1.3 MPa to obtain an intermediate film after formal crimping. The obtained interlayer film after the main pressure bonding is in a state where the interlayer film after the main pressure bonding is arranged in a laminate between the first glass plate and the second glass plate. (Examples 2 to 9, 11 and Comparative Examples 1 to 4, 6) Production of interlayer film before crimping: Set the following items as shown in Tables 1 and 2 below, except that they are the same as Example 1 The way to obtain the intermediate film. The compounding amount of the plasticizer in the composition used to form the first layer and the composition used to form the second and third layers relative to 100 parts by weight of the polyvinyl acetal resin The minimum thickness and maximum thickness in the intermediate film , The average of the rate of change of the partial wedge angle, the maximum value of the rate of change of the partial wedge angle, the number of contact points after the third step and before the fourth step, in Examples 2-9, 11 and Comparative Example 1 In ~4 and 6, the same type of ultraviolet shielding agent and antioxidant as in Example 1 were blended in the same blending amount as in Example 1 (0.2 parts by weight relative to 100 parts by weight of the polyvinyl acetal resin). Furthermore, in the examples and comparative examples, the interlayer films were extruded by using molds of different shapes, respectively. Production of a laminate for measuring the wedge angle of a part of the interlayer film after formal crimping: Using the obtained interlayer film before crimping, a laminate containing the interlayer film after formal crimping was produced in the same manner as in Example 1. body. (Example 10) Production of a composition for forming a single-layer interlayer film: The following blending ingredients were blended and kneaded thoroughly with a mixing roller to obtain a composition for forming a single-layer interlayer film. Other components are added to the polyvinyl acetal resin. Polyvinyl acetal resin (hydroxyl content 30.5 mol%, acetylation degree 1 mol%, acetalization degree 68.5 mol%) 100 parts by weight triethylene glycol bis(2-ethylhexanoate) (3GO) 40 parts by weight of Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF) Production of 0.2 parts by weight of BHT (2,6-di-tert-butyl-p-cresol) 0.2 parts by weight of single-layer intermediate film: Using an extruder, the composition used to form the single-layer intermediate film is extruded. After the intermediate film is extruded, heat the intermediate film to 100°C to 150°C, keep it for a holding time within 5 minutes, and return to normal temperature. Production of a laminate for measuring the partial wedge angle of the interlayer film after formal crimping: Using the obtained interlayer film, in the same manner as in Example 1 to produce the interlayer film after formal crimping for measuring the partial wedge angle The laminated body. (Example 12 and Comparative Examples 5 and 7) Production of interlayer film before crimping: The following items were set as shown in Table 3 below, and except for that, an interlayer film was obtained in the same manner as in Example 10. The blending amount of the plasticizer in the intermediate film relative to 100 parts by weight of the polyvinyl acetal resin The minimum thickness, the maximum thickness, the average of the rate of change of the above-mentioned partial wedge angle, and the maximum value of the rate of change of the above-mentioned partial wedge angle in the intermediate film The number of contact points after the third step and before the fourth step. In Example 12 and Comparative Examples 5 and 7, the same type of ultraviolet shielding agent and antioxidant as in Example 10 were used as the same as those in Example 10. The blending amount (0.2 parts by weight relative to 100 parts by weight of the polyvinyl acetal resin) is blended. Furthermore, in the examples and comparative examples, the interlayer films were extruded by using molds of different shapes, respectively. (Evaluation) (1) The modulus of elasticity was measured in the following manner for the second and third layers in the interlayer film before crimping in Examples 1 to 9, 11 and Comparative Examples 1 to 4, 6, and Examples 10 and 12 And the elastic modulus of the interlayer film before crimping in Comparative Examples 5 and 7 at 23°C. Measuring method of elastic modulus: Prepare a mixture of the composition used to form the layer or intermediate film for measurement. The obtained kneaded product was press-formed at 150°C using a press-forming machine to obtain a resin film with a thickness of 0.35 mm. Place the obtained resin film at 25°C and a relative humidity of 30% for 2 hours. After being left for 2 hours, the viscoelasticity was measured using "ARES-G2" manufactured by TA Instruments. As a jig, a parallel plate with a diameter of 8 mm is used. The measurement is carried out under the condition that the temperature is reduced from 30°C to -50°C at a cooling rate of 3°C/min, and the frequency is 1 Hz and the strain is 1%. Furthermore, the measurement of the modulus of elasticity can also be carried out in the following manner. After storing the obtained interlayer film at a room temperature of 23±2°C and a relative humidity of 25±5% for one month, peel off the second layer and the second layer from the interlayer film at a room temperature of 23°C±2°C. 3 layers, thereby obtaining the 2nd and 3rd layers. The second and third layers obtained can also be press-formed at 150°C so that the thickness becomes 0.35 mm (in the unpressurized state at 150°C for 10 minutes, in the pressurized state at 10 minutes at 150°C) to produce a resin film. (2) The rate of change of the partial wedge angle. The measurement of the partial wedge angle of the interlayer film before crimping: Use the "TOF-4R" manufactured by Sanbun Electric Company to measure the partial wedge angle by the above method. Measurement of the partial wedge angle of the interlayer film after formal crimping: Use the "OPTIGAUGE" manufactured by Metrics to measure the partial wedge angle by the above method. The wedge angle of each part was measured at every 10 mm point in the first region from a position of 40 mm from the one end to the other end of the intermediate film to the center between the one end and the other end. In addition, in the second region of the intermediate film from a position of 40 mm from the one end to the other end to a position of 40 mm from the other end to the one end, each part of the wedges was measured every 10 mm. Horn. In the measurement in the above-mentioned first area, the rate of change of the partial wedge angle of each point is obtained according to the above-mentioned formula (X). In the measurement in the above-mentioned first region, the average value of the rate of change of the partial wedge angle is obtained according to the above-mentioned formula (Y). In the measurement in the above-mentioned second area, the rate of change of the partial wedge angle of each point is obtained according to the above-mentioned formula (X). In the measurement in the second area described above, the maximum value of the rate of change of the partial wedge angle is set to the maximum value of the rate of change of the partial wedge angle. (3) Set the obtained laminated body to the position of the windshield with the double image. The display information is reflected from the display unit arranged under the laminated body to the laminated glass, and the presence or absence of double images is visually confirmed at a specific position (the entire corresponding area of the display). The double image is judged based on the following criteria. [Judgment criteria for double images] ○○: No double images are confirmed. ○: Although few double images are confirmed, it is a level that does not affect the actual use. ×: Does not meet the judgment standards of ○○ and ○. Details and results are shown In the following Tables 1 to 3. [Table 1]
Figure 107108829-A0304-0001
 [Table 2]
Figure 107108829-A0304-0002
 [table 3]
Figure 107108829-A0304-0003
 Furthermore, regarding the laminated glass using the interlayer films obtained in Examples 1 to 9, and 11, the sound insulation properties were evaluated based on the sound transmission loss, and as a result, it was confirmed that the sound insulation properties were excellent.

1、1A、1X‧‧‧第1層1Aa‧‧‧厚度方向之剖面形狀為矩形之部分1Ab‧‧‧厚度方向之剖面形狀為楔狀之部分2、2X‧‧‧第2層3、3X‧‧‧第3層11、11A‧‧‧中間膜11X‧‧‧中間膜部11a‧‧‧一端11b‧‧‧另一端11Aa‧‧‧厚度方向之剖面形狀為矩形之部分11Ab‧‧‧厚度方向之剖面形狀為楔狀之部分21‧‧‧層合玻璃22‧‧‧第1層合玻璃構件23‧‧‧第2層合玻璃構件51‧‧‧輥體61‧‧‧捲芯R1‧‧‧顯示對應區域R2‧‧‧周圍區域R3‧‧‧陰影區域1, 1A, 1X‧‧‧The first layer 1Aa‧‧‧The part where the cross-sectional shape in the thickness direction is rectangular 1Ab‧‧‧The part where the cross-sectional shape in the thickness direction is wedge-shaped 2, 2X‧‧‧The second layer 3, 3X ‧‧‧The third layer 11、11A‧‧‧Intermediate film 11X‧‧‧Intermediate film part 11a‧‧One end 11b‧‧‧The other end 11Aa‧‧‧The thickness direction of the cross-sectional shape is rectangular part 11Ab‧‧‧Thickness The cross-sectional shape of the direction is a wedge-shaped part 21‧‧‧Laminated glass 22‧‧‧The first laminated glass component 23‧‧‧The second laminated glass component 51‧‧‧Roll body 61‧‧‧Roll core R1‧ ‧‧Display the corresponding area R2‧‧‧The surrounding area R3‧‧‧Shaded area

圖1(a)及(b)係模式性地表示本發明之第1實施形態之層合玻璃用中間膜之剖視圖及前視圖。 圖2(a)及(b)係模式性地表示本發明之第2實施形態之層合玻璃用中間膜之剖視圖及前視圖。 圖3係表示使用圖1所示之層合玻璃用中間膜之層合玻璃之一例的剖視圖。 圖4係模式性地表示捲繞圖1所示之層合玻璃用中間膜所獲得之輥體之立體圖。Figs. 1(a) and (b) schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to the first embodiment of the present invention. Figs. 2(a) and (b) schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to a second embodiment of the present invention. Fig. 3 is a cross-sectional view showing an example of laminated glass using the interlayer film for laminated glass shown in Fig. 1. Fig. 4 is a perspective view schematically showing a roll body obtained by winding the interlayer film for laminated glass shown in Fig. 1.

1‧‧‧第1層 1‧‧‧Level 1

2‧‧‧第2層 2‧‧‧Level 2

3‧‧‧第3層 3‧‧‧Level 3

11‧‧‧中間膜 11‧‧‧Intermediate film

11a‧‧‧一端 11a‧‧‧One end

11b‧‧‧另一端 11b‧‧‧the other end

R1‧‧‧顯示對應區域 R1‧‧‧Display the corresponding area

R2‧‧‧周圍區域 R2‧‧‧ Surrounding area

R3‧‧‧陰影區域 R3‧‧‧Shaded area

Claims (13)

一種層合玻璃用中間膜，其係用於層合玻璃者，並且 具有一端、與位於上述一端之相反側之另一端， 上述另一端之厚度大於上述一端之厚度， 上述中間膜之厚度自上述一端至上述另一端並非均一地增加， 使用上述層合玻璃用中間膜作為壓接前之中間膜，依序經由以下之第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜，對於上述壓接前之中間膜及上述正式壓接後之中間膜之各者，於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至上述一端與上述另一端間之中央位置為止的第1區域中每隔10 mm之各地點測定各部分楔角時，根據下述式(X)所求出之部分楔角之變化率之平均值為10%以下； 部分楔角之變化率(%)＝｜(正式壓接後之中間膜之部分楔角－壓接前之中間膜之部分楔角)/(壓接前之中間膜之部分楔角)｜×100 式(X) 第1步驟：將壓接前之中間膜自一表面側載置於第1玻璃板上；該第1玻璃板具有與壓接前之中間膜相同之大小且具有2 mm之厚度；該第1玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃； 第2步驟：將第2玻璃板以使上述第2玻璃板之一端與上述中間膜之一端對齊且使上述第2玻璃板之面方向與上述第1玻璃板之面方向成直角方向之方式載置於上述中間膜之另一表面上；該第2玻璃板具有與壓接前之中間膜相同之大小且具有2 mm之厚度；該第2玻璃板係依據JIS 3202-2011所獲得之浮法平板玻璃； 第3步驟：一邊固定上述第2玻璃板之上述一端一邊將上述第2玻璃板傾倒，使上述第2玻璃板之表面與上述中間膜之上述另一表面接觸，且將上述第2玻璃設為上述第2玻璃之重量於上述中間膜之上述另一表面上達到均衡之狀態； 第4步驟：藉由240℃及98 N/cm之線壓力之輥壓進行預壓接； 第5步驟：於140℃及1.3 MPa之壓力下進行正式壓接，而獲得正式壓接後之中間膜；所獲得之正式壓接後之中間膜係將正式壓接後之中間膜配置在上述第1玻璃板與上述第2玻璃板之間的積層體之狀態。An intermediate film for laminated glass, which is used for laminated glass, and has one end and the other end on the opposite side of the one end, the thickness of the other end is greater than the thickness of the one end, and the thickness of the intermediate film is from the above One end is not uniformly increased from one end to the other end. Use the interlayer film for laminated glass as the interlayer film before crimping, and go through the following steps 1, 2, 3, 4, and 5 to obtain a formal press. For the intermediate film after bonding, for each of the intermediate film before the crimping and the intermediate film after the formal crimping, the position of the intermediate film 40 mm from the one end to the other end to the one end and the above When measuring the wedge angle of each part in the first area from the center position between the other ends at every 10 mm point, the average value of the rate of change of the wedge angle calculated by the following formula (X) is 10% or less ； Partial wedge angle change rate (%)=|(Partial wedge angle of the intermediate membrane after formal crimping-Partial wedge angle of the intermediate membrane before crimping)/(Partial wedge angle of the intermediate membrane before crimping)｜ ×100 formula (X) Step 1: Place the interlayer film before crimping on the first glass plate from one surface side; the first glass plate has the same size as the interlayer film before crimping and has 2 mm The thickness; the first glass plate is a float plate glass obtained in accordance with JIS 3202-2011; the second step: the second glass plate so that one end of the second glass plate is aligned with one end of the intermediate film and the The second glass plate is placed on the other surface of the intermediate film in such a way that the surface direction of the second glass plate is at right angles to the surface direction of the first glass plate; the second glass plate has the same size as the intermediate film before crimping and It has a thickness of 2 mm; the second glass plate is float plate glass obtained in accordance with JIS 3202-2011; the third step: while fixing the one end of the second glass plate, the second glass plate is tilted to make the The surface of the second glass plate is in contact with the other surface of the intermediate film, and the second glass is set to a state where the weight of the second glass is balanced on the other surface of the intermediate film; fourth step: Pre-crimping is performed by roll pressing at 240°C and 98 N/cm linear pressure; Step 5: Formal crimping is performed at 140°C and 1.3 MPa pressure to obtain the intermediate film after formal crimping; Obtained The interlayer film after the formal pressure bonding is a state in which the interlayer film after the formal pressure bonding is arranged in a laminate between the first glass plate and the second glass plate. 如請求項1之層合玻璃用中間膜，其中於上述中間膜之從自上述一端起朝向上述另一端40 mm之位置至自上述另一端起朝向上述一端40 mm之位置為止的第2區域中每隔10 mm之各地點測定各部分楔角時，根據上述式(X)所求出之部分楔角之變化率之最大值為15%以下。The interlayer film for laminated glass of claim 1, wherein in the second region of the interlayer film from a position 40 mm from the one end toward the other end to a position 40 mm from the other end toward the one end When measuring the wedge angle of each part every 10 mm, the maximum value of the rate of change of the wedge angle calculated according to the above formula (X) is 15% or less. 如請求項1或2之層合玻璃用中間膜，其於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述一端與上述另一端間之中央位置為止的區域中，於隔開之2個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。For example, the interlayer film for laminated glass of claim 1 or 2, the third step when the interlayer film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence After that and before the fourth step, in the region of the intermediate film from the position of the one end to the center position between the one end and the other end, two or more parts separated from each other become the intermediate film and the second The state of glass contact. 如請求項1或2之層合玻璃用中間膜，其於依序經由上述第1、第2、第3、第4及第5步驟而獲得正式壓接後之中間膜時之上述第3步驟之後且上述第4步驟之前，於上述中間膜之自上述一端之位置至上述另一端之位置為止的區域中，於隔開之3個部位以上成為上述中間膜與上述第2玻璃板接觸之狀態。For example, the interlayer film for laminated glass of claim 1 or 2, the third step when the interlayer film after formal crimping is obtained through the first, second, third, fourth, and fifth steps in sequence After that and before the fourth step, in the region from the position of the one end to the position of the other end of the interlayer film, the interlayer film is in contact with the second glass plate at 3 or more places. . 如請求項1或2之層合玻璃用中間膜，其具備23℃下之彈性模數G'為4 MPa以上之層。For example, the interlayer film for laminated glass of claim 1 or 2, which has a layer whose elastic modulus G'at 23°C is 4 MPa or more. 如請求項1或2之層合玻璃用中間膜，其具備23℃下之彈性模數G'為4 MPa以上之層作為表面層。For example, the interlayer film for laminated glass of claim 1 or 2, which has a layer having an elastic modulus G'at 23° C. of 4 MPa or more as a surface layer. 如請求項1或2之層合玻璃用中間膜，其含有熱塑性樹脂。The interlayer film for laminated glass of claim 1 or 2, which contains a thermoplastic resin. 如請求項1或2之層合玻璃用中間膜，其含有塑化劑。Such as the interlayer film for laminated glass of claim 1 or 2, which contains a plasticizer. 如請求項1或2之層合玻璃用中間膜，其中上述中間膜具備含有熱塑性樹脂、與相對於上述熱塑性樹脂100重量份為25重量份以上且45重量份以下之含量之塑化劑之層。The interlayer film for laminated glass according to claim 1 or 2, wherein the interlayer film includes a layer containing a thermoplastic resin and a plasticizer with a content of 25 parts by weight or more and 45 parts by weight relative to 100 parts by weight of the thermoplastic resin . 如請求項1或2之層合玻璃用中間膜，其具備： 第1層、與 配置於上述第1層之第1表面側之第2層。The interlayer film for laminated glass of claim 1 or 2, comprising: a first layer, and a second layer arranged on the first surface side of the first layer. 如請求項10之層合玻璃用中間膜，其中 上述第1層含有聚乙烯縮醛樹脂， 上述第2層含有聚乙烯縮醛樹脂， 上述第1層中之上述聚乙烯縮醛樹脂之羥基之含有率低於上述第2層中之上述聚乙烯縮醛樹脂之羥基之含有率。The interlayer film for laminated glass of claim 10, wherein the first layer contains a polyvinyl acetal resin, the second layer contains a polyvinyl acetal resin, and the hydroxyl group of the polyvinyl acetal resin in the first layer The content rate is lower than the content rate of the hydroxyl group of the polyvinyl acetal resin in the second layer. 如請求項10之層合玻璃用中間膜，其中 上述第1層含有聚乙烯縮醛樹脂， 上述第2層含有聚乙烯縮醛樹脂， 上述第1層含有塑化劑， 上述第2層含有塑化劑， 上述第1層中之上述塑化劑相對於上述第1層中之上述聚乙烯縮醛樹脂100重量份之含量高於上述第2層中之上述塑化劑相對於上述第2層中之上述聚乙烯縮醛樹脂100重量份之含量。The interlayer film for laminated glass of claim 10, wherein the first layer contains a polyvinyl acetal resin, the second layer contains a polyvinyl acetal resin, the first layer contains a plasticizer, and the second layer contains a plastic The content of the plasticizer in the first layer relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is higher than that of the plasticizer in the second layer relative to the second layer The content of the above-mentioned polyvinyl acetal resin in 100 parts by weight. 一種層合玻璃，其具備： 第1層合玻璃構件、 第2層合玻璃構件、及 配置於上述第1層合玻璃構件與上述第2層合玻璃構件之間之中間膜部， 上述中間膜部由如請求項1至12中任一項之層合玻璃用中間膜所形成。A laminated glass comprising: a first laminated glass member, a second laminated glass member, and an intermediate film portion arranged between the first laminated glass member and the second laminated glass member, the intermediate film The part is formed of the interlayer film for laminated glass as claimed in any one of claims 1 to 12.
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